AI SMM publishes through the networks’ own publishing interfaces, so each network decides what it accepts. The composer warns you about missing required fields (a YouTube title, a Reddit title, a TikTok caption) and wrong media counts, but text length and file specs are up to you, so it helps to know the rules when you plan content.
Formats by network
| Network | What you can publish | Worth knowing |
|---|---|---|
| Feed photos and videos, carousels, Reels, Stories | No text-only posts; professional account needed; Reels need exactly one video, Stories exactly one file | |
| Facebook Pages | Photos or video, Reels, Stories | Photos and video cannot be mixed in one post; no carousels |
| Threads | Text, photos, videos, carousels | |
| TikTok | Video, photo carousel | |
| YouTube | One video per post | Needs a title |
| Text, images, video, link | Personal profile and company pages | |
| X | Text, up to 4 images or 1 video, polls | Short text limit |
| Pin with one image or one video | Needs a board; title and link recommended | |
| Telegram | Text, photo, video, albums of 2–10 files, polls, spoilers | 4,096 characters in text, 1,024 under media |
| Text post or link post | ||
| Discord | Message with an image, polls | No threads |
| Bluesky | Text and up to 4 images | No video |
| Mastodon | Text, media, polls | Media and a poll cannot be in one post |
| Odnoklassniki | Group posts with text and images, polls |
Text length
The composer’s counter shows a general limit of 2,200 characters, which is Instagram’s limit (with up to 30 hashtags). Other networks differ: X is much shorter, Bluesky cuts text after 300 characters, Telegram allows 4,096 characters in a text post but only 1,024 in a caption under a photo or video, LinkedIn allows about 3,000. When a post goes to several networks, write for the shortest one or adapt the text with Repurpose.
Instagram in detail
- Meta limits how many posts an account can publish through third-party tools in 24 hours (Posts, Reels and Stories together). If you hit the limit, the rest can go out the next day or from the Instagram app.
- Up to 10 files in a carousel.
- Photos: JPEG; the ratio for feed posts is from 4:5 to 1.91:1. Stories and Reels are best at 9:16.
- Videos: MP4 or MOV. Reels can be much longer than feed videos; very long or very large files are more likely to be rejected.
Media tips for every network
- Vertical 9:16 video works in Reels, Stories, TikTok and Shorts; square or 4:5 is safest for feeds.
- Use common formats: JPEG or PNG for images, MP4 (H.264) for video.
- Very large files upload slowly and fail more often. Compress long videos before uploading.
- For a post to several networks, choose media all of them accept, or create a separate post for the network with different needs.
When a network rejects a post
The post is marked as failed in the calendar with the network’s reason. Fix the text or media and send it again. The rules above change from time to time on the networks’ side; the network’s own error message always shows the current reason.
More: publishing to 14 networks.
Write to support: a person answers, usually within a working day. Inside the app, the Knowledge base has lessons for every section.