Facebook.com
I would call facebook.com, a new phase of life to many people. I got signed up to facebook.com a year and a half back. Initially, I was using orkut.com but alas it is banned in Saudi(place where I reside now!). That is when I became active in facebook.com. What I noticed in facebook(FB) was that it has more privacy and it stands out to be more classy than any other social network sites. I mainly use mobile to access FB through facebook mobile version. It helps me alot to get updates on wall and find friends without even having to depend on a PC. I am so thankful to the team members of FB for the creation of facebook mobile version.
Facebook generally is free from spams, which is a great blessing. I feel FB has got unique features to itself and I must appreciate its classy layout.
I find the " people you may know" feature of FB to be very useful. I have found my old buddies through that feature and most of them are buddies whom I have long forgotten or seldom remember about. Any ways, I would call it a one of its kind social network site.
I hope FB never gets banned in Saudi.
Longlive facebook.com!