Social Post

Social Post — Cross-Platform Content Distribution

Post content across multiple social media platforms: X (Twitter), LinkedIn, Threads, Hacker News, Reddit, Instagram, and DEV.to.

Trigger

When the user asks to post content across social media, distribute a post, share on multiple platforms, or says "social post", "cross-post", "share everywhere".

Prerequisites

API-based (automated)

• X/Twitter: OAuth 1.0a keys at ~/.config/x/.env — use /x-post skill
• LinkedIn: OAuth 2.0 token at ~/.config/linkedin/.env (CLIENT_ID, CLIENT_SECRET, ACCESS_TOKEN, PERSON_ID)
• Telegram: Telethon via ~/.config/telegram/session (credentials in $TELEGRAM_API_ID / $TELEGRAM_API_HASH env vars). Channels from CLAUDE.md Personal Info.

Browser-based (requires user's authenticated session)

• Threads: Use Claude in Chrome (tabs_context_mcp) — user's Threads handle is in CLAUDE.md Personal Info
• Hacker News: Use Claude in Chrome (tabs_context_mcp) — user is signed in
• Reddit: Use Claude in Chrome — user is signed in
• DEV.to: Use Claude in Chrome (tabs_context_mcp) — user is signed in
• Instagram: Mobile-only for Reels; copy caption to clipboard for manual paste

Process

1. Prepare content variants

Each platform needs different formatting. From the user's raw content, generate:

2. Post via API (X + LinkedIn)

X/Twitter Thread

Use the /x-post skill with thread format.

LinkedIn Post

source ~/.config/linkedin/.env

curl -s -X POST "https://api.linkedin.com/v2/ugcPosts" \
  -H "Authorization: Bearer ${LINKEDIN_ACCESS_TOKEN}" \
  -H "Content-Type: application/json" \
  -H "X-Restli-Protocol-Version: 2.0.0" \
  -d '{
    "author": "urn:li:person:'"${LINKEDIN_PERSON_ID}"'",
    "lifecycleState": "PUBLISHED",
    "specificContent": {
      "com.linkedin.ugc.ShareContent": {
        "shareCommentary": {
          "text": "POST_TEXT_HERE"
        },
        "shareMediaCategory": "NONE"
      }
    },
    "visibility": {
      "com.linkedin.ugc.MemberNetworkVisibility": "PUBLIC"
    }
  }'

Note: LinkedIn API cannot edit or read existing posts. Only create and delete. If a post is cut off or wrong, delete and re-post.

3. Post via browser (Threads + HN + Reddit)

Threads

Use Claude in Chrome for authenticated posting. Account handle from CLAUDE.md Personal Info.

1. tabs_context_mcp(createIfEmpty: true) → get tabId
2. Navigate to https://www.threads.com
3. Click "What's new?" or the compose button (+)
4. Use JavaScript to insert text reliably (the type action loses line breaks):

   const editor = document.querySelector('[contenteditable="true"][role="textbox"]');
   editor.focus();
   document.execCommand('selectAll', false, null);
   document.execCommand('delete', false, null);
   document.execCommand('insertText', false, postText);
   

5. Click "Post"
6. Get the post URL from the profile page or "View" toast link

Important Threads notes:

• 500 char limit per post. For longer content, post a single condensed version (not a multi-part thread — browser automation of Threads threads is unreliable)
• Links auto-generate a rich preview card with image and title
• No hashtags needed (Threads doesn't use them for discovery like Instagram)
• Line breaks via \n in insertText may collapse — the content still reads fine as a block

Use Claude in Chrome for authenticated pages:

tabs_context_mcp(createIfEmpty: true) → get tabId → navigate → interact

Hacker News

1. Navigate to https://news.ycombinator.com/submit
2. Fill title field: Show HN: <title> (keep under 80 chars)
3. Fill URL field with the link
4. Leave text blank (comment separately after posting)
5. Click submit
6. Copy first comment to clipboard — HN doesn't show comment box on own new posts immediately

Reddit

1. Navigate to https://www.reddit.com/r/{subreddit}/submit
2. Fill title and body
3. Click submit
4. Good subreddits for AI/dev content: r/ClaudeAI, r/artificial, r/SideProject, r/programming

4. Telegram (API-based)

Post to both channels using Telethon:

cd ~/.config/telegram && uvx --python python3 --from telethon python3 -c "
import asyncio, os
from telethon import TelegramClient

API_ID = int(os.environ['TELEGRAM_API_ID'])
API_HASH = os.environ['TELEGRAM_API_HASH']

async def main():
    client = TelegramClient('\$HOME/.config/telegram/session', API_ID, API_HASH)
    await client.start()
    # EN channel — use channel name from CLAUDE.md
    await client.send_message(EN_CHANNEL, EN_TEXT)
    # RU channel — use Russian translation, link to Russian blog post
    await client.send_message(RU_CHANNEL, RU_TEXT)
    await client.disconnect()

asyncio.run(main())
"

Important:

• The Russian channel must link to the Russian blog post URL (e.g. razbakov.com/blog/2026-03-24-slug-ru), not the English one.
• After posting, capture the message IDs and add telegram: links back to the blog post frontmatter using the channel handles from CLAUDE.md.

5. DEV.to (browser-based)

Use Claude in Chrome for authenticated posting:

1. Navigate to https://dev.to/new
2. Select all existing content (Cmd+A) and replace with full article
3. Use Jekyll frontmatter format:

---
title: Article Title Here
published: false
description: Short description for SEO and social cards
tags: tag1, tag2, tag3, tag4
cover_image: https://img.youtube.com/vi/VIDEO_ID/maxresdefault.jpg
canonical_url: https://razbakov.com/blog/YYYY-MM-DD-slug
---

IMPORTANT: Always include canonical_url pointing to the original blog post. This prevents duplicate content SEO issues and credits the source.

4. Embed YouTube videos with: {% embed https://www.youtube.com/watch?v=VIDEO_ID %}
5. Use full markdown: headers, tables, bold, code blocks, lists
6. Set published: false as draft for review, or true to publish immediately
7. Article should be longer and more technical than other platforms — include implementation details, code snippets, lessons learned

Content guidelines for DEV.to:

• Technical depth — this is a developer audience
• Include code snippets and architecture details
• Use markdown tables for structured data
• End with a discussion question
• 4 tags max (lowercase, no spaces)
• Cover image uses YouTube thumbnail by default

5. Instagram (manual assist)

Instagram doesn't support API posting for personal accounts. Copy the caption to clipboard:

echo 'CAPTION_HERE' | pbcopy

Tell the user: "Instagram caption is in your clipboard. Open Instagram → create post/reel → paste."

6. Report results

After posting, output a summary:

Posted:
- X: https://x.com/<handle>/status/...
- LinkedIn: https://www.linkedin.com/feed/update/urn:li:activity:.../
- Threads: https://www.threads.com/@<handle>/post/...
- HN: https://news.ycombinator.com/item?id=...
- Reddit: https://www.reddit.com/r/.../comments/...
- DEV.to: https://dev.to/<handle>/... (draft or published)
- Instagram: caption copied to clipboard (manual)

LinkedIn API Setup (if token doesn't exist)

1. Go to https://www.linkedin.com/developers/apps → Create app
2. App name: "Social Poster", Company page: any
3. Under Products tab → request "Share on LinkedIn" and "Sign In with LinkedIn using OpenID Connect"
4. Under Auth tab → add redirect URL: http://localhost:8888/callback
5. Save Client ID and Client Secret to ~/.config/linkedin/.env
6. Run python3 ~/.config/linkedin/get-token.py to complete OAuth flow
7. Token is saved automatically. Expires in 60 days — re-run get-token.py to refresh.

Content Guidelines

• X: Hook first tweet hard. End thread with CTA. No hashtags in tweets (they don't help on X).
• LinkedIn: Professional but personal. Use emoji bullets. End with a question to drive engagement. Hashtags at the very end (6 max).
• Threads: Conversational, casual. Condense to 500 chars. Include a link for auto-preview card. No hashtags.
• HN: Technical, humble, no marketing language. "Show HN" for things you built. First comment should be substantive context.
• Reddit: Match subreddit tone. Include AMA offer. Markdown tables work well.
• DEV.to: Full technical blog post. Include code snippets, architecture details, lessons learned. Embed YouTube with {% embed URL %}. 4 tags max. End with discussion question. Longer and deeper than other platforms.
• Instagram: Visual-first. Short punchy lines. Heavy hashtags (10-15). "Link in bio" instead of URLs.

Rate Limits

• X: 100 tweets/15min ($0.01/tweet on pay-per-use)
• LinkedIn: 100 posts/day
• HN: 1 submission every ~10 minutes
• Reddit: varies by karma and subreddit