Mastodon has just been updated, and now suggests people to follow to new members.
If your instance runs version 3.4.0 or higher, you can opt in to this follow suggestion feature by going to:
Preferences > Profile > Suggest account to others (tick the box, then click the Save Changes button at the top)
This also adds you to the profile directory.
Instance admins can add or block suggestions, so if you see someone unsuitable being suggested let them know.
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.
Fosstodon is an English speaking Mastodon instance that is open to anyone who is interested in technology; particularly free & open source software.