1. You can slap your friends and get away without any physical injury. Moreover, you can even get some support from your other friends!
2. You can find out how you were related to your friends in your previous birth. Even our real life astrologers fail to reveal such valuable details.
3. You get people to answer questions on your behalf. Interesting questions, mind you!
4. People end up liking anything you say. Imagine that happening in real life -- people stopping you in between sentences and saying 'Hey, I liked that previous sentence you just said!'. This makes Facebook even more unique.
5. You get to add celebrities and you can even propose to them. Below is my proposal to Jose Covaco (MTV VJ). Yes, I find him hot! No more explanation needed!