I have had multiple avatars online.
Not multiple personalities... Well who knows, maybe I do. Perhaps that's why I've chosen different pictures for different tools.
I've noticed some of the people I follow use the same avatar across tools. It helps me recognize them, which I like. I've also seen people change their avatar which I find strangely unsettling.
I have condensed my avatars over the last couple of weeks. I'm down to 2.
I think I'll leave it at that. At least for now.