Well, if your trying to date, then no. If your just trying to meet or talk to girls your age then it can work well. I've found a great site for it, but you have to be careful. What are you trying? Wrongplanet, is a horrible site to meet girls, IMO. No one seems American, and there's no real mean of finding them on here. WP, is a great site to find advice from though.
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"But in general, at first shy guys may seem interesting and cute, but it DOES get old really quick. Gets too boring."