there is this website i discovered awhile back called onxiam.  essentially you create a log in for this site and then proceed to fill in all your various identities across the web.  if you make it that far you will see a drop down box for all the various sites and services that you possibly have an identity for...  i spent an afternoon filling out mine with this sort of pathological need to fill in all the blanks, all the while thinking (cue my best joan crawford imitation) no. more. social. networks. ever!!!

 

b.