Facebook allows no formatting in posts. With Unicode characters you can still add emphasis — for headings in longer posts or announcements in groups.
Space is plentiful on Facebook: up to 63,206 characters per post. That makes structure all the more important, because the feed truncates with "See more" after around 477 characters.
A bold opening line helps catch the eye before the rest disappears behind the click.
Frequently asked questions
Can you write Facebook posts in bold?
Not through Facebook itself. Generate the text here, copy it and paste it in.
Does it work in groups and comments?
Yes, anywhere you can type or paste text.
When does my post get truncated?
In the feed after around 477 characters — beyond that it takes a click on "See more".
Do I need an app?
No, everything runs in your browser.
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