i've met many a people from the internet. I met my fiance in an AIM chatroom 6 years ago. He's the person i met in person in the shortest amount of time, it only took a week. But i met him in the middle of the day at my moms work so haha it was all good.
I've met all my ex bfs/gfs online. Whether it be craigslist,Yahoo chats,LJ,Teen Open Diary, or other sites. I usually add people to facebook (now a days, before facebook it was AIM) before i'll even think about meeting them, i need to see how they react with their family/friends and what vibe other people get from them.
My bestfriends (and Maid of honor and brides maid in my wedding) i met here on bloop and i've known them both for 2/3 years.
Bad experiance.... I had a friend that i met in an AIM chat, we were friends for 5 years (13-18) he was my best friend for a while, lived only an hour away. He got his license and a car when he turned 18 and came up to see me. After being such a sweet/caring/understanding man on the phone, he turned out to be a complete creeper in person. He wanted to get a room and have sex and when i refused he got pissed, he got out of the car for a smoke and i called a friend of mine whom came to pick me up. I had to deal with crazy angry phone calls all day/night from dude.
But as i said, i've been with my fiance for 6 years now and we are happy and healthy and my brother met my sister in law on E-harmony and they have been married 4 years now and have 3 kids.
I just use extream caution, always.