One thing I have noticed about 'teenagers' and sexuality is that it is definitely becoming more mainstream for girls to be 'bi'. I think the raves and 'ecstacy' definitely helped that along.
But it is quite 'in' now to be a bisexual girl. (for guys I still don't see it being such an 'open' thing...) There are several online communities for bisexual women. (lesbian women too for that matter)
I always thought there was an online market for lesbian women.
Bisexual teenage girls. Just a fad? It seems that way right now, but once it has passed the fad stage, will it become 'mainstream' and viewed as a 'normal' part of sexuality?
It will be interesting to see down the line....