The old timers around here (of which I am not yet one) highly recommend each individual having their own screen name/account. It can be confusing to reply and not know to which person we are speaking.
You might want to do a tag search for 'unicorns' and read up those threads.
I recently went to my first 'real life' meeting of polyfolks in my town, and it was lovely. I wouldn't go there looking for 'a girl to join us,' though.
Folks around here also highly recommend okcupid for a site to meet people into poly. It's free, and easy to make your preferences known.
Love is that condition in which the happiness of another person is essential to your own...
Robert A. Heinlein
Me: female, bi, (formerly hinge of a vee)
with FirstBoyFriend (FBF)(moderately long-distance)
and no longer with CurrentBoyFriend (CBF)(who lives in the apartment building next door)