Facebook is different from Twitter in that it has more applications but you cannot just start following people,they must accept you first.You can tell the world alot more about yourself and learn more about others.
Using Facebook and Twitter will generate leads quickly and at the same time allow people to get to know you.They will come to trust you,see you as a friend,and be more likely to do business with you.
Watch this video below about signing up and the difference between the home and profile page.