A person you have met once, goes to your school or has a close relationship with you.
Most Facebook friends are people you aren't really friends with and are just people who go to your school and you've found by typing in school name and adding everyone as a "friend".
If you have 600+ Facebook friends, seriously, think about removing some.
Some bitchy sluttish girls tell you every day you need to improve Facebook friend numbers to make you more popular, especially if you are a boy.
Wow! I have 572 friends! Wait, who the f*ck is (INSERT NAME)? Oh yeah, they go to my school! What about (INSERT NAME)? Oh yeah! I met them once in the shopping mall! Oooh! Someone I know through Dad! I'll add them as a Facebook "Friend".
A complicated website used by old people who think Twitter is what people use nowadays. Many TV and radio shows and celebrities boast about having a Twitter account.
Twitter also restricts you to 140 characters (WHY?!?!) and there are no privacy settings.
There is also hardly anything to do. It's like a complicated, basic Facebook.
The reason it's 'complicated' is because nobody understands how you USE the site; what's 'retweeting'?, what are these '@Mentions'? IT'S COMPLICATED!
Person A: 'Hey follow me on Twitter!'
Person B: 'Dude, seriously, get a Facebook.'