I changed mine because that's what everyone else was doing! As a general rule, I only post avvies that represent my interests, but if a place is friendly and familiar enough, I'll add my pic. But on some forums, this just isn't the done thing. I remember joining one forum and automatically putting my picture up as my avatar, but everyone mocked me something chronic, so I swiftly took it down!
Not trying to be obtuse, I've always used DFWTexan42 as my online handle, just continue to do so for consistency across all the social networks I use, same with the Kirk/Spock avatar. My real name is Jerry
When I despair, I remember that all through history the ways of truth and love have always won. There have been tyrants, and murderers, and for a time they can seem invincible, but in the end they always fall. Think of it--always. - Mahatma Gandhi