Orkut has copied a lots of features from Facebook now and almost on par with Facebook. It's strange nobody uses LinkedIn, I use to go on it long time back but not anymore...
I have to go with Facebook. It seems even that Facebook is becoming less for marketing, and more for simply building relationships based on interests. Of course that is a great way to market, but because of all the limitations, newer guidelines, and barriers that Facebook has been developing, to me it is really going back to what it originally was built for - a virtual social hang-out site.
I don’t use Social Networking Sites. I prefer other forms of communication, like phone or Instant messaging or face to face contact
Of course it would have to be facebook. I's really easy to keep in touch and see what every single one of your friend is doing, where is he going, who's in a relationship with who and so on.