Connect Facebook to X

Before you start

• A Facebook Page you manage. Facebook only lets apps read posts from Pages, not personal profiles.
• An X account you can sign in to.
• A Post Once account. The free plan includes 10 reposts, with no card needed.

How to connect Facebook to X

1. Create a free account at app.postonce.com. After two short intro screens, Post Once asks where you post.

2. Under Where do you post first?, pick Facebook and press Continue.

   

3. Under Where else should it land?, pick X. Add any other apps, or a backup, then press Continue.

4. On Connect your accounts., press Connect on the Facebook row. Sign in with Facebook. In Facebook’s permissions dialog, make sure the Page you post on is selected. Back in Post Once, pick it in the Repost from Page list on the Facebook row. With only one Page, it is picked for you.

   

5. Press Connect on the X row. Sign in on X’s page and authorize Post Once.

6. When both rows say Connected, press Go to dashboard.

From then on, keep posting on Facebook as usual. Post Once checks it about every five minutes and reposts each new post to X.

Already using Post Once?

If Facebook is already the source of your bridge, open Bridge and press Connect next to X in the Destinations card, or press Add destination on the dashboard.

If your bridge reads from another account, add a second bridge with Facebook as its source from the bridge switcher. Free and Solo include 1 bridge, Studio 3 and Agency as many as you need. See bridges.

What each Facebook post becomes on X

On Facebook	On X
A Reel or video up to 3 minutes, vertical or square	A video post.
A video over 3 minutes, or a landscape one	Skipped, with “X only takes short vertical videos”.
A photo	A photo post.
A photo album	The first 4 photos, because X allows 4 per post.
A text or link post	A text post, with links written as example[dot]com. One over 280 characters is skipped with “Too long for X (280 characters)”.
A Page Story	Skipped. X does not take Stories.

A skipped post shows the reason on your dashboard and still goes to your other destinations. See long videos for how Post Once tells short from long.

How your caption carries over

The post text goes with each repost. When a link post leaves the link out of its text, Post Once adds it. Events and check-ins are not reposted.

X allows 280 characters, so Post Once:

1. writes links as plain text, such as example[dot]com/page, dropping https://, www. and tracking tags,
2. leaves the links out when they would push the caption past 280 characters,
3. shortens what is left to 280 characters, counted the way X counts them, and ends it with “…” when it had to cut.

Choose what goes to X

On the Bridge page, the X row has two settings.

• What to post has a switch for Videos, Photos and Text posts. Switch a kind off and those posts skip X, though you can still send one there by hand. Switching every kind off pauses X.
• Rewrite caption changes the caption for X only: Remove comment, DM and link in bio prompts, Remove hashtags and mentions, Rewrite with AI to suit X, and Add your own text at the start or end. Each one is off until you turn it on.

Check that it works

Post something on Facebook as usual. Within about five minutes it shows up under Your posts on the dashboard (press Check now to look straight away), then goes to X. Each post shows where it went, what was skipped and why.

If a repost fails, Post Once tries again up to 5 times over about half an hour. If it still fails, you get an email, and Retry sends it again to just the accounts it missed. See a post did not repost.

Only posts published after you connect are reposted on their own. Older ones are listed in Your posts, where you can send any of them by hand.