I don't know if it is what you are looking for, but I met my wife on Yahoo! Personals. We met about 7 years ago, and have been happily married for the past 2 years. Of course it helped that after we met on-line, we found out we had mutual friends, thus making it easier and less risky for us to meet in person.
I think meeting people on the internet is like meeting people in life. Some you will like, some you will hate, and the potential is there for a relationship to develop. But always be safe. Take time to get to know them on-line before meeting in person, and if you do meet in person, do so in a public place like a park or restaurant. Again, take the time to get to know them in a public setting before going anywhere private. And always let someone know where you will be. Follow your head and it can be a safe and fun experience. /PSA