Would like to know how you look up friends here on fluther?

I think you are already doing pretty well, asking this question.
Most everybody will read it (probably), and the ex-Askvillers who will do so, will make themselves known (if they wish so).
I am not an old Askville member, by the way.

Hey, Squeeky! Here I be!

Welcome to Fluther! If you know their usernames, you can type them in to the search box up on the right of the page. Then you can send them a message and let them know you’re here.