Of course it's okay to meet someone online!
Tim and I started talking in an IRC channel based around the webcomic, College Roomies From Hell!!! The IRC channel folk decided to have a "convention" in Seattle in 2005, and Tim and I both went. I was dating someone else at the time who also went, so Tim and I only really spoke one night I was able to get away from the boyfriend and we sat together a few times at meals. We continued our online friendship, exchanging emails and IMs all the time, and if he was absent for a bit, I'd get worried....and our friendship grew and grew. We flirted, we teased, we made plans for me to visit "someday" (as friends). Long story short, I broke up with the boyfriend I had been dating and started seeing another guy Tim knew through the IRC channel. Tim was always there for me and he became one of my best friends. We tried chatting via Skype, but since he was on dial-up, it was hard. He finally upgraded to broadband, and we tested out Skype and spent 8 hours chatting! The guy I had been seeing chose to end things with me before I went on holiday with some friends, and Tim was there for me. Making sure he was on for me to talk to, texting me while I was away, really just being the best friend I needed.
I decided instead of going on a cruise in 2009, I was going to visit Tim. We discussed it and picked 2 weeks in the fall...which then grew to 2 months, all before we started dating. Tim was going to fix up his guest room for me, and while we talked about the possibility of something happening between us, we agreed that no matter what, this was a friendly visit and was about showing me the UK to see if I really wanted to live here or not.
Then one day in July, we realised we had real feelings for each other, and decided we wanted to date....and here we are. I'm in the middle of my visit to him, and it's grand.