Hmm, you really have to be careful with online dating.
There are normal people on there, who just happen to not find it easy to meet people during their regular day to day life.
However, at the same time, ask yourself this question. Why, if someone is worth dating, are they using an online system to find a partner?
Anyway, women in particular have to be very careful, because you never know what is out there... and you can be sure they are practiced at answering all the questions you might ask to try to find out.
Meet in a public place. Bring along another friend or two. Don't let your email address/account show your full name. Don't give out a phone number unless it is a cell number and won't lead to an address. Don't trust that any pictures you see are remotely like the person you'll meet. Take everything as slow as you want and don't worry about letting them slip away.
Once you've met once or twice and have seen them in public, you'll have a much better idea of their personality and what they are looking for.
Anyway, I've used online dating, looking for a serious relationship. I've met some women with serious baggage from previous relationships in the past... which was unfortunate.