When follow suggestions are shown to new members on Mastodon, they only see the first line of profile biogs.
If you have opted into appearing in follow suggestions, it's a good idea to make the first line of your biog as useful as possible, so that new members will know why they might want to follow you.
I am not sure!
As far as I can tell, it is up until the line break, but it will trim it if it's too long.
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