"Myspace, Match, eHarmony, CL… they all suck for the elegantly simple reason that online there are too many indiscriminate horny men and too few cute girls. The dynamics are totally in the woman’s favor, ridiculously so in that it encourages massive self-assessment inflation that will carry over into real life social interactions, guaranteeing disappointment."
http://heartiste.wordpress.com/2007/09/12/online-dating-is-f... is an interesting article on online dating.
A great youtube video on why online dating doesn't work: https://www.youtube.com/watch?v=Qe5_JK_LcEI