What's this about being added to somebody's fluther only to see that he or she is no longer on Fluther?

Probably spammers that got their account nuked.

Could be someone that was banned that came back to the site under another name.

It’s spammers usually. Happened to me too recently.

It happened to me also. I figure it is a spammer trying to look legit.

Just happened to me as well. Received message from moderator about phathom user.
Good to see Fluther moderators are on top of it.