I'm one of those "don't want my picture floating around Internet"-people.
I use the same alias (that is actually my name - Asa Wi*****) whenever possible since since mid 90's so somehow I still don't feel very "anonymous".
Besides, over here in Sweden I'm recognized by the pooch in my avatar. Always in my company and to many people I'm just "the one with the big friendly black and white dog". Suits me fine!