What most people find out, though, is that's not green grass they're looking at. It's moldy cow s***. To not have the discernment to know is the real issue.
As someone pointed out, the internet is anonymous. SpaceBook (yes, I know, don't point it out...) aside, the internet is a mysterious place. And it's it's the mystery of it that appeals to people. Go into Yahoo chat or AIM chat and see how many people are in there looking for "chat." (It's rather ridiculous.) For a lot of people it's the fantasy of it, the ability to do whatever you want, whenever you want without having to deal with the repercussions later. I guess that could be put in the "other" catagory.
As for those going on to SpaceBook and falling for the "old flame," again, isn't it discernment? Isn't there a reason this person is the "ex?" Is it really about trying to live a fantasy life instead of living the life before you?