your friends still think your a big dork because you spend all your time on facebook.
You can't become "Invisible" on Facebook Chat. Instead you can appear "Offline" though still be on Facebook, just others cannot see that you are online.
Down in the right corner there is a small icon representing a person and a green dot. click it and choose "Go offline" now you show as offline, and people will not know you are there, but you can still use facebook as you always have.
Normally you can see if they are on facebook chat, however the person can go offline facebook chat and still be on the site. in this case you would have no way of knowing.
It is not being hacked now it was shut down, but yes you can play offline and they system will even update your trophies you earned while it was offline. see related question
The current trend shows young adults as well as teens as the most frequent Facebookers, but every other age still can Facebook.
Adf.ly was banned from Facebook, because Facebook didn't want people to earn money from their posts. But people are still able to get around the block by putting their adf.ly link in other link shorteners, like tinyurl, then posting it on Facebook.
use a proper facebook messenger, it's better plus has more features. use this http://www.facebook.com/apps/application.php?id=102332746051&sk=info you can be invisible while still seeing who is online. And be online to some friends, while appearing offline to others. Also has a cool away/busy function.
Yes
You can't end a chat. What you can do is click on the cross button. They can still post stuff to you.If you go onto your facebook chat, then go to options, there should be options to pop in and out the chat and appear offline.
Starcraft II can be played offline.
Yes, a lot of people do.
There are no age limits. Some people on facebook are even still in their mothers wombs.