Feature of Facebook: Networking
Wondering what you do with your Facebook account other than looking at friends’ photo, updates and joining some other clubs as fans?
As part of the powerful and useful features of Facebook, you can get to know more new friends and expand your own network. But one thing about adding new friends, where you can hit the maximum friends added per day, or per visit.
Below image show how Facebook give a warning. Guess how many friends you can add per visit?

OR, this:

