Lol...i'm an expert in this stuff!
Let me tell you....facebook, as mentioned here for divorce rate, is the very tip of the iceberg! If there is a computer in your home then your marriage/relationship is in VERY dangerous waters! (and that's without what your kids do on theirs!)
FB, twitter, etc are the interactive sites of choice for the normal, everyday innocent folks.My experience is with the old Yahoo chat rooms and later, blogs. I suppose it can be the same with FB and those mentioned today, i only use it to see what my friends are babbling about, but back then it was just Yahoo. From my very first day online ever....right upto today, everything is based around strangers wanting sexual activity from strangers! Doesn't matter in what form, that's all many, especially men, were/are interested in.
The most lethal tool in the online world is ....the webcam! I've seen women who worship their husbands and take their kids to church on sundays, lose ALL inhibitions when on a cam!
I could relate countless tales and experiences of everyday women who won't even wear a bikini at the beach, getting up to anything and everything you'd care to mention once hubby/boyfriend isn't there and a webcam is! But this isn't the site for it so they shall be kept off here.
I've never worked out what causes them to be like they are when online. My only conclusions have been "boredom" or "being naughty". I talk about the womens side of the coin here but trust me, the men are 3 times as lethal. I've seen marriages,loving relationships, families crumble slowly as the partner realises what's been going on, and i've seen them explode violently for the same reason. I doubt the people involved could explain why they did what they did half the time!
One of the most lethal online sites is mentioned in the OP...Second Life!
I spent 2 years playing that game and take it from me, sex is plentiful and truly rampant! It's also ridiculous because everyone has a beautiful cartoon avatar and for some unknown reason everyone thinks everyone elses avatar looks just like them in real life!
people fall deeply in love, leave partners, travel thousands of miles to different countries....all based on a cartoon!! Let me tell you, there's been a LOT of very disappointed people lol!
The internet as a whole is a deadly place for any marriage or relationship. Growing up, the only access i had to "porn" was the odd magazine i found that had been thrown away by someone. The internet has done for the divorce rate what it has done for access to porn!