No. I'm single. If I thought there was real potential for us to be a couple, I would travel around the world to visit them. I don't think I would live out of the US though.
Temporarily (2.5 months, and I'm looking to bring that down to 2 months) long-distance. Once you're over a certain distance (ie, more than 10 hours of driving for me) and planes start to get involved... Travel gets expensive. I don't think I would place an upper limit on distance in an LDR, more like a lower limit on the amount of times we see each other. I don't think I could maintain a relationship without seeing my significant other several times a year. I wouldn't voluntarily seek out an LDR -- even these 2.5 months are tough --, and I'm not sure I could make one work in the long term.
My girlfriend and I have been together for almost two years now. About half that time, I was eight hours away at uni. Summers, though, it was only an hour's drive so I was actually able to see her. She just moved overseas (temporarily) and it sucks but we're still doing okay.
I used to be. I don't think I can do it again though. It was good while it lasted, but soon enough there were things that made the relationship suffer. This is not to say that long distance relationships (LDR) aren't good or satisfying, and I have a lot of respect for those people who are in one. For me however, I'm unsure if I can go through another one. I was with this person for a year and a few months, I'm in Canada and my then partner lived some 7,000 miles away. The arrangement was that I finish university and work to have enough money to go where she is, and then find a way to live together. I worked two jobs while going to university, and sure enough I graduated with enough savings, but we parted ways before I even got to go to where she is. LDRs are a risk, you just have to know how much you're willing to risk.
I used to be in a couple of LDRs but I didn't have much of a chance with them since they didn't last very long. I might be able to give it a shot again but it would really have to depend on the person on the other side. I don't really find that distance matters, even though I don't have a passport yet.
I have before and I would never do it again. Personally, It's too hard to be in a long distance relationship. It's too hard to maintain and you can't be there with them. The last long distance relationship I was in was the worst because it ended up that she lied to me about everything. I say to those who are in an online relationship or are open to one to be careful. You could totally fall in love with the wrong person.
I have been previously and possibly would again if it was for the right person and we saw each other frequently enough to keep the romance alive. There's nothing better than being able to talk to someone for hours on end except for being able to snuggle up to them and talk to them for hours on end.