social-media-api-best-practices（social media API 最佳实践）

Social Media API Best Practices

Battle-tested patterns from scheduling 1M+ posts across 13 platforms.

1. Authentication Patterns

OAuth 2.0 Platforms

Instagram (Meta Graph API)

• Two-step token exchange: short-lived (1 hour) → long-lived (60 days)
• Use auth_type: 'rerequest' to force permission re-prompts
• Exchange endpoint: ig_exchange_token grant type
• Scopes: instagram_business_basic, instagram_business_content_publish, instagram_business_manage_messages

Twitter/X (PKCE Required)

• PKCE with S256 code challenge is mandatory
• Embed code verifier in state: ${state}-cv_${codeVerifier}
• Scopes: tweet.read, tweet.write, users.read, offline.access, media.write
• Access token: 2 hours, refresh token: long-lived

function generateCodeVerifier(): string {
  return crypto.randomBytes(32).toString('base64url');
}

function generateCodeChallenge(verifier: string): string {
  return crypto.createHash('sha256').update(verifier).digest('base64url');
}

function extractCodeVerifierFromState(state: string): string {
  const match = state.match(/-cv_(.+)$/);
  return match ? match[1] : '';
}

TikTok

• Full UX compliance required for API audit approval
• Must show: privacy_level selector, comment/duet/stitch toggles
• Commercial content disclosure mandatory
• Scopes: user.info.basic, video.publish, video.upload

LinkedIn

• Always include header: X-RestLi-Protocol-Version: 2.0.0
• API version header: LinkedIn-Version: 202511
• Access token: 60 days, refresh token: 365 days
• Supports both personal (urn:li:person:) and organization (urn:li:organization:) posts

YouTube

• Requires access_type=offline AND prompt=consent for refresh tokens
• Supports both user channels and brand accounts
• Scopes: youtube.upload, youtube, yt-analytics.readonly

Facebook

• Page access tokens are separate from user tokens
• Exchange user token for page token via /me/accounts
• Supports scheduled publishing via scheduled_publish_time

Threads

• Similar to Instagram (Meta), 2-step token exchange
• Use th_exchange_token grant type
• Scopes: threads_basic, threads_content_publish, threads_manage_replies

Pinterest

• Basic auth with base64 encoding
• Scopes: pins:read, pins:write, boards:read, boards:write

Google Business Profile

• Google OAuth with business.manage scope
• Uses My Business v4 API (deprecated but functional)

Reddit

• OAuth with duration=permanent for long-lived tokens
• Strict user-agent requirement - Reddit enforces descriptive user agents
• Scopes: identity, submit, read, mysubreddits, privatemessages

const headers = {
  'User-Agent': 'YourApp/1.0 by /u/YourUsername'
};

Non-OAuth Platforms

Bluesky (AT Protocol)

• No traditional OAuth - uses DIDs (Decentralized Identifiers)
• Authentication via accessJwt + refreshJwt from AT Protocol
• PDS (Personal Data Server) resolution required
• Auto-refresh on ExpiredToken error

// Bluesky authentication
const session = await agent.login({
  identifier: 'user.bsky.social',
  password: 'app-password'
});
// session contains: accessJwt, refreshJwt, did, handle

Snapchat

• Basic auth, allowlist-only (requires Snapchat dev team approval)
• Limited public API - profile API focus

Telegram

• Bot token only - no OAuth flow
• Token format: BOT_ID:SECRET
• No user authentication, bot must be added to chat/channel

2. Rate Limiting Strategies

Platform-Specific Limits

Twitter's Three-Tier Rate Limits

Twitter has THREE levels of limits - check all:

1. App-level 24-hour limit (most restrictive)
2. User-level 24-hour limit
3. Endpoint-specific rate limit

function parseRateLimitHeaders(headers: Headers) {
  return {
    // Endpoint limits
    remaining: parseInt(headers.get('x-rate-limit-remaining') || '0'),
    reset: parseInt(headers.get('x-rate-limit-reset') || '0'),
    // App-level 24h limits
    appRemaining: parseInt(headers.get('x-app-limit-24hour-remaining') || '0'),
    appReset: parseInt(headers.get('x-app-limit-24hour-reset') || '0'),
    // User-level 24h limits
    userRemaining: parseInt(headers.get('x-user-limit-24hour-remaining') || '0'),
    userReset: parseInt(headers.get('x-user-limit-24hour-reset') || '0'),
  };
}

Exponential Backoff Pattern

async function withRetry<T>(
  fn: () => Promise<T>,
  maxRetries = 3,
  baseDelay = 5000
): Promise<T> {
  for (let attempt = 0; attempt <= maxRetries; attempt++) {
    try {
      return await fn();
    } catch (error) {
      if (!isRetryableError(error) || attempt === maxRetries) throw error;
      const delay = Math.min(baseDelay * Math.pow(2, attempt), 30000);
      await sleep(delay);
    }
  }
  throw new Error('Max retries exceeded');
}

function isRetryableError(error: any): boolean {
  const status = error.status || error.statusCode;
  return [429, 500, 502, 503].includes(status);
}

3. Media Requirements

Complete Platform Limits

Golden Rule: Stream Large Files

Never load entire files into memory:

// BAD - loads entire file into memory
const buffer = await fetch(url).then(r => r.arrayBuffer());

// GOOD - streams directly
const response = await fetch(url);
await uploadToPlatform(response.body); // Pass the stream

Problematic Media Sources

These hosts return HTML or timeout instead of direct media:

const PROBLEMATIC_HOSTS = [
  'drive.google.com',
  'docs.google.com',
  'dropbox.com',
  'onedrive.live.com',
  '1drv.ms'
];

// Solution: Re-host to your own storage first
if (PROBLEMATIC_HOSTS.some(h => url.includes(h))) {
  url = await reHostToStorage(url);
}

Dropbox URL Fix

function fixDropboxUrl(url: string): string {
  if (url.includes('dropbox.com') && url.includes('dl=0')) {
    return url.replace('dl=0', 'dl=1');
  }
  return url;
}

4. Video Upload Patterns

Chunked Upload (Twitter)

async function chunkedUpload(videoBuffer: Buffer, mediaType: string) {
  const CHUNK_SIZE = 4 * 1024 * 1024; // 4MB chunks

  // INIT
  const initRes = await api.post('/media/upload', {
    command: 'INIT',
    total_bytes: videoBuffer.length,
    media_type: mediaType
  });
  const mediaId = initRes.media_id_string;

  // APPEND chunks
  for (let i = 0; i < Math.ceil(videoBuffer.length / CHUNK_SIZE); i++) {
    const chunk = videoBuffer.slice(i * CHUNK_SIZE, (i + 1) * CHUNK_SIZE);
    await api.post('/media/upload', {
      command: 'APPEND',
      media_id: mediaId,
      media: chunk.toString('base64'),
      segment_index: i
    });
  }

  // FINALIZE
  await api.post('/media/upload', {
    command: 'FINALIZE',
    media_id: mediaId
  });

  // Poll for processing
  await pollProcessingStatus(mediaId);

  return mediaId;
}

Resumable Upload (YouTube)

YouTube supports resumable uploads for reliability with large files. Use the youtube-chunked-upload module or implement the resumable upload protocol.

Processing Status Polling

async function pollProcessingStatus(mediaId: string, maxWaitMs = 300000) {
  const startTime = Date.now();

  while (Date.now() - startTime < maxWaitMs) {
    const status = await api.get(`/media/upload?command=STATUS&media_id=${mediaId}`);

    if (status.processing_info?.state === 'succeeded') return;
    if (status.processing_info?.state === 'failed') {
      throw new Error(status.processing_info.error?.message || 'Processing failed');
    }

    const checkAfter = (status.processing_info?.check_after_secs || 5) * 1000;
    await sleep(checkAfter);
  }

  throw new Error('Processing timeout');
}

5. Error Handling

Error Categorization

type ErrorType = 'refresh-token' | 'retry' | 'user-error';

function categorizeError(platform: string, error: any): ErrorType {
  if (isTokenError(error)) return 'refresh-token';
  if (isTemporaryError(error)) return 'retry';
  return 'user-error';
}

Instagram Error Codes

The Instagram 2207051 Edge Case

Instagram's anti-spam sometimes returns "blocked" but actually publishes:

async function handleInstagram2207051(accountId: string) {
  await sleep(5000);

  const recentMedia = await getRecentMedia(accountId);
  const justPosted = recentMedia.find(m =>
    Date.now() - new Date(m.timestamp).getTime() < 60000
  );

  if (justPosted) {
    return { success: true, postId: justPosted.id };
  }
  throw new Error('Post actually failed');
}

TikTok Error Codes

Twitter/X Error Codes

Bluesky Error Codes

Reddit Error Codes

Telegram Error Codes

6. Platform Quirks

JavaScript Large Integer IDs (Instagram/Facebook)

Instagram IDs exceed MAX_SAFE_INTEGER (17+ digits):

function safeJsonParse(text: string) {
  // Wrap large integers in quotes before parsing
  const safe = text.replace(/"id"\s*:\s*(\d{15,})/g, '"id":"$1"');
  return JSON.parse(safe);
}

Twitter Character Counting

function countTwitterCharacters(text: string): number {
  let count = 0;

  // URLs always count as 23 characters
  const urlRegex = /https?:\/\/[^\s]+/g;
  const urls = text.match(urlRegex) || [];
  const textWithoutUrls = text.replace(urlRegex, '');

  count += urls.length * 23;

  // Emojis and CJK count as 2
  for (const char of textWithoutUrls) {
    count += char.match(/[\u{1F600}-\u{1F64F}]|[\u4e00-\u9fff]/u) ? 2 : 1;
  }

  return count;
}

Twitter Character Limits by Tier

LinkedIn Text Escaping

Reserved characters: | {} @ [] () < > # \ * _ ~

function escapeLinkedInText(text: string): string {
  const reserved = /[|{}@\[\]()<>#\\*_~]/g;

  return text.replace(reserved, (match, offset) => {
    if (isInsideMention(text, offset)) return match;
    if (isInsideHashtag(text, offset)) return match;
    return '\\' + match;
  });
}

TikTok UX Compliance Requirements

TikTok requires full UX compliance for API audit:

• User must manually select privacy level (no defaults)
• Must show comment/duet/stitch toggles
• Commercial content disclosure with user confirmation
• Content preview before upload
• Express consent declaration

Reddit User-Agent Requirement

Reddit strictly enforces descriptive user agents:

// BAD - will be blocked
headers['User-Agent'] = 'axios/1.0';

// GOOD - descriptive format
headers['User-Agent'] = 'MyApp/1.0 (by /u/developer_username)';

Telegram HTML Subset

Only these HTML tags are supported:

<b>, <strong>       <!-- bold -->
<i>, <em>           <!-- italic -->
<u>                 <!-- underline -->
<s>, <strike>, <del><!-- strikethrough -->
<code>              <!-- monospace -->
<pre>               <!-- code block -->
<a href="...">      <!-- link -->
<tg-spoiler>        <!-- spoiler -->
<blockquote>        <!-- quote -->

7. Special Protocols

AT Protocol (Bluesky)

Bluesky uses AT Protocol, not OAuth:

Key Concepts:

• DID (Decentralized Identifier): User's permanent ID (e.g., did:plc:abc123)
• PDS (Personal Data Server): Where user data lives
• Handle: Human-readable name (e.g., user.bsky.social)

Rich Text Facets:

Mentions and links use byte-offset positioning:

function createFacets(text: string): Facet[] {
  const facets: Facet[] = [];
  const encoder = new TextEncoder();

  // Find mentions
  const mentionRegex = /@([a-zA-Z0-9.-]+)/g;
  let match;

  while ((match = mentionRegex.exec(text)) !== null) {
    const beforeText = text.slice(0, match.index);
    const byteStart = encoder.encode(beforeText).length;
    const byteEnd = byteStart + encoder.encode(match[0]).length;

    facets.push({
      index: { byteStart, byteEnd },
      features: [{
        $type: 'app.bsky.richtext.facet#mention',
        did: await resolveDid(match[1])
      }]
    });
  }

  return facets;
}

Snapchat AES-256-CBC Encryption

Snapchat requires media encryption before upload:

import crypto from 'crypto';

function encryptForSnapchat(buffer: Buffer): {
  encrypted: Buffer;
  key: string;
  iv: string;
} {
  const key = crypto.randomBytes(32); // 256 bits
  const iv = crypto.randomBytes(16);  // 128 bits

  const cipher = crypto.createCipheriv('aes-256-cbc', key, iv);
  const encrypted = Buffer.concat([
    cipher.update(buffer),
    cipher.final()
  ]);

  return {
    encrypted,
    key: key.toString('base64'),
    iv: iv.toString('base64')
  };
}

8. Quick Debugging Checklist

When a post fails:

1. Check token validity - Is the access token expired?
2. Check rate limits - Hit daily/hourly limits?
3. Check media URL - Can the platform fetch it directly?
4. Check media specs - Right format, size, dimensions, aspect ratio?
5. Check the 2207051 case - Did it post despite the error?
6. Check account status - Is the account restricted?
7. Check subreddit rules - (Reddit) Links allowed? Flair required?
8. Check user-agent - (Reddit) Descriptive enough?
9. Check bot permissions - (Telegram) Bot in chat with send rights?

9. Recommended Architecture

your-app/
├── lib/
│   ├── platforms/
│   │   ├── base.ts           # Abstract base class
│   │   ├── instagram.ts
│   │   ├── tiktok.ts
│   │   ├── twitter.ts
│   │   ├── bluesky.ts        # AT Protocol
│   │   ├── snapchat.ts       # With encryption
│   │   └── ...
│   ├── utils/
│   │   ├── rate-limiter.ts
│   │   ├── media-handler.ts
│   │   ├── error-mapper.ts
│   │   └── encryption.ts     # For Snapchat
│   └── queue/
│       └── scheduler.ts

10. Platform Comparison Matrix

About This Guide

This guide is maintained by Late, built from real patterns learned while scheduling 1M+ posts across all 13 platforms.

Every error code, edge case, and quirk documented here comes from production experience. The Instagram 2207051 gotcha? We discovered it after hours of debugging. The Snapchat encryption requirement? Learned the hard way.

Building a social media app? If you'd rather not implement and maintain all these integrations yourself, Late's API handles the complexity for you: OAuth, media processing, rate limits, error handling, and scheduling across all 13 platforms with a single integration.

*Maintained by Late - Social Media Scheduling API for Developers*