Platform specifications
What each network accepts through PostFlow, and the rules checked before a post is accepted.
Each post target picks a content type. Its rules are checked before the post can be scheduled
(pre-flight), and GET /content-types returns them
as JSON so your code or agent can check first.
What each platform supports
Section titled “What each platform supports”| Platform | Formats | Text-only | First comment | Comments inbox | Direct messages | Metrics |
|---|---|---|---|---|---|---|
| Photo, carousel, Reel, Story | No | ✓ | ✓ read, reply, hide | ✓ | ✓ | |
| Text/link, photo, video, Reel | ✓ | ✓ | ✓ read, reply, hide | ✓ Messenger | ✓ | |
| TikTok | Video, photo post | No | No | No | No | ✓ |
| Threads | Text, image, video, carousel | ✓ | ✓ (reply) | No | No | ✓ |
| YouTube | Short, video | No | No | No | No | ✓ |
| Bluesky | Post (up to 4 images), video | ✓ | No | No | No | ✓ |
| Telegram | Message, photo/video | ✓ | No | No | No | No |
“First comment” also enables followUps (comments or a Threads thread posted minutes after the post).
Every content type
Section titled “Every content type”| Id | Platform | Format | Media | Kinds | Aspect (w/h) | Video length | Max size (image / video) | Caption max | First comment |
|---|---|---|---|---|---|---|---|---|---|
fb_post |
Text / link post | 0 | none | – | – | – / – | 63,206 | yes | |
fb_photo |
Photo post | 1–10 | image | – | – | 10 MB / – | 63,206 | yes | |
fb_video |
Video | 1 | video | – | 1–14400 s | – / 4 GB | 63,206 | yes | |
fb_reel |
Reel | 1 | video | 0.5–0.6 | 3–90 s | – / 1 GB | 63,206 | yes | |
ig_image |
Image | 1 | image | 0.8–1.91 | – | 8 MB / – | 2,200, 30 hashtags | yes | |
ig_carousel |
Carousel | 2–10 | image, video | 0.8–1.91 | 3–60 s | 8 MB / 100 MB | 2,200, 30 hashtags | yes | |
ig_reel |
Reel | 1 | video | 0.01–10 | 3–900 s | – / 300 MB | 2,200, 30 hashtags | yes | |
ig_story |
Story | 1 | image, video | – | 3–60 s | 8 MB / 100 MB | none | no | |
tt_video |
tiktok | Video | 1 | video | – | 3–600 s | – / 4 GB | 2,200 | no |
tt_photo |
tiktok | Photo post | 1–35 | image | – | – | 20 MB / – | 4,000 | no |
th_text |
threads | Text post | 0 | none | – | – | – / – | 500 | yes |
th_image |
threads | Image | 1 | image | 0.1–10 | – | 8 MB / – | 500 | yes |
th_video |
threads | Video | 1 | video | 0.01–10 | 1–300 s | – / 1 GB | 500 | yes |
th_carousel |
threads | Carousel | 2–20 | image, video | 0.01–10 | 1–300 s | 8 MB / 1 GB | 500 | yes |
tg_message |
telegram | Message | 0 | none | – | – | – / – | 4,096 | no |
tg_media |
telegram | Photo / video | 1–10 | image, video | – | – | 5 MB / 20 MB | 1,024 | no |
bs_post |
bluesky | Post | 0–4 | image | – | – | 2 MB / – | 300 | no |
bs_video |
bluesky | Video | 1 | video | – | 1–180 s | – / 286 MB | 300 | no |
yt_short |
youtube | Short | 1 | video | 0.5–1 | 1–180 s | – / 4 GB | 5,000 | no |
yt_video |
youtube | Video | 1 | video | – | 1–43200 s | – / 256 GB | 5,000 | no |
Aspect is width ÷ height: 0.8–1.91 is 4:5 to 1.91:1; 0.5–0.6 is about 9:16. Sizes are the platform’s limits; PostFlow’s own
upload limit is 30 MB for images and 1 GB for videos.
Platforms also check things PostFlow can’t see in advance (content policies, daily limits, processing). Those come back on the
target with a plain-language errorMessage. See Post statuses.