First off myspace/facebook are generally a waste of time for men. You can hook up from it and people do all the time, but the return on investment is pretty low. The only time I've hooked up with a girl on myspace is if she initiated contact first, then your chances of getting a hookup go up dramatically. But sending out random emails to girl after girl saying "you're beautiful" is a waste of time and is pretty stupid too. Attractive girls I know who use myspace constantly complain about having to delete dozens of messages a day of guys all saying the same shyt, "you're beautiful", "hey baby", blah blah over and over again. After weeks upon weeks of it, they get jaded and just ignore them or set their profiles to private. Myspace and Facebook COULD be great tools to meet girls, but they are abused by guys who message every attractive girl they see, forgetting that she's probably been messaged the same exact thing 30 times that day. And then guys sit there thinking "gee, why didn't she respond to me???"
If you are sending out random messages, your chances of reeling in a fish are so small that it's hardly worth the time. The 3% of them that responde back, they'll continue the conversation for maybe a couple messages then disappear. If you're a well above average looking guy, or have a lot of social proof that's obvious from yoru profile, your success rate might be higher. But the AVERAGE guy which is most of us, won't find much success. You'll improve your chances if you read her profile, make sure she has lots in common with you and then respond to something specific in her profile. Never message her a comment about her looks. Say something like, "Hi, I see you went to Japan last year, I was thinking of going there too and your photos were enough to convince me to do it". Then when she responds, chat her up like you would any regular girl in real life. I guess you could say that's a form of a situational opener. People that put up vacations photos are super flattered to hear people compliment them since they spent so much money going to their destination and want to show it off to everyone. Even though you've seen a goddamned million people posed in front of the Eiffel Tower, everyone that takes that same pic and posts it online thinks there's is special. Play to that mentality and your chance of getting a response go up greatly. It doesn't have to be about vacation photos, it could be pics of her pets, something interesting she said about a book or movie, or some band, whatever. After MAKING SURE YOU AND HER HAVE THINGS IN COMMON, find something she's apparently passionate about from her page, and then message her something about it. If it's in a C+F way that's even better.
I've experimented with something else in the past and had good results. I don't know why but girls fvcking love horiscopes. I think it's the biggest crock of bullshyt in the world. Sometimes I've sent a message that said, "I read your profile, you are SUCH a typical Leo it's funny" and they reply back almost instantly with, "why? why? why??? Tell me!" Then followed it up with some C+F, but admittedly, never got far beyond that, guess my game needs some work in that regards, but hey that's why we're all on sosuave right? Anyway, I don't even bother with the online crap these days. I have a myspace and I've gone on some dates from it, but only because the girl hit me up first.