Yes, I am a married lawyer, which I offer simply as a description. The internet is a good place to meet like-minded people and to do some filtering.
I can see that it might be, although I don't care for it. What I've noticed that people who do it leave out too often is talking on the phone before meeting. You can't 'filter' anywhere enough with just the flatness of internet-speak. I have met internet people before, but never for fucking; and even then I always have insisted on talking to them on the phone. I do know a girl who corresponded only to her future Iranian husband by emails, met him with no phone call, and married him--to live in Iran for 2 years now, wearing the veil. I have met her exactly 2 years ago, and I think she has well-earned this fate, as she was so dizzy as to be out of bade Twilight Zone bullshit. Who knows? Maybe she'll get to meet Ahmadinejad, as we all know, these big leaders with their religiosity always end up getting involved with two many women, wanting concubines to make up for their smallish dicks (sometimes, that is: I imagine Saddam Hussein was hunger than holy hell, but he then did have the women he raped run over by cars after he fucked them, so he was not precisely a gentleman).
In fact, I myself met her through the internet, and it was NOT worth it! She was one of the stupidest people I've ever met.