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Social media API guides
Start herePlatform guides5 min read
How to post to Instagram via API
To post to Instagram through an API, connect an Instagram Business or Creator account that is linked to a Facebook Page, then send the media and a caption to a publishing endpoint. Instagram publishing is two steps on Meta's side (create a container, then p...
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- 4 min read
Bluesky and Mastodon posting API guide
Bluesky and Mastodon are the two open-protocol platforms you can post to with a simple credential instead of an OAuth app. For Bluesky you give a h...
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Post to Telegram, Discord and Slack with an API
Telegram, Discord and Slack are the credential-based channels: no OAuth screen, just a bot token or a webhook URL that you paste into Socifyr once....
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Specs and limits
- 5 min read
X (Twitter) API posting limits and costs
Posting to X through an API is metered, not free. Socifyr estimates the cost at $0.015 per post and $0.20 for a post that contains a link, caps eac...
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Instagram Reels, TikTok and YouTube Shorts video specs
Short-video limits differ per platform. By Socifyr's constants: Instagram accepts 300 MB and 15 minutes, TikTok 4 GB and 10 minutes, and YouTube 25...
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Social media caption length limits by platform
Caption limits range from 280 characters on X to 400,000 on Dev.to. The ones people hit most are X at 280, Bluesky at 300, Threads, Pinterest and M...
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Social media image size and aspect ratio requirements
Image limits vary more than caption limits. Per-file size runs from 1 MB on Bluesky to 25 MB on Dev.to, the number of images per post runs from 1 (...
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Social media API daily posting limits by platform
Socifyr enforces a rolling 24-hour posting cap per platform, from 10 posts on YouTube and 15 on TikTok up to 250 on Tumblr. Separately, the API all...
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Agents and MCP
- 5 min read
How to give an AI agent safe access to your social accounts
Give an agent a scoped API key instead of your platform logins, then cap what that key can do. In Socifyr a key belongs to one workspace, never exp...
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How MCP servers let Claude post to social media
A Model Context Protocol (MCP) server exposes actions as named tools that an AI client such as Claude can call. For social media, the server wraps...
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Operations
- 4 min read
How to schedule social media posts with an API
To schedule a social media post with an API, add an ISO 8601 scheduledAt time to the same request you would use to publish. Socifyr queues the post...
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OAuth token expiry: how to refresh or reconnect social accounts
Most social platforms issue access tokens that expire. Some can be renewed silently with a refresh token, and others (Instagram, Facebook, LinkedIn...
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How to cross-post to multiple platforms with one API call
To cross-post with an API, list several connection slugs in one request. Socifyr fans the post out to each account in parallel, and each account su...
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