I don't even go by my real name on FB. But many people there know it. I've told people here too, but just the ones I know.

On twitter I have too much beef with neonazis, who can get dangerous in RL. If you know my name I am easy to google because I have to stay visible as a scientist.

I really like the anonymous internet, funnily enough I find people are more civil than in the spaces where real names are used.