Facebook (www.facebook.com) was invented in 2004. This year (2012) will be the 8th year of Facebook!!
No, you don't have to be invited to Facebook. You can just go to the Facebook website, and create an account for free. An online training site called Grovo can help you with setting up and managing your Facebook account.
Be invited by the owner.
Be invited to view them.
I'm assuming you meant "invented". Mark Zuckerberg is typically credited with the invention of Facebook.
your friends might of invited you to facebook
It just means that there is an event that somebody is throwing e.g a party and they have invited you you dont neceserily have to go though
It sounds like you have been invited to a party.
If they have clicked "going" i believe so, yes.
That's not a legit question, the person that invited you would decide that.
Yea, there is a few out there but it is hard to find. Yesterday my friend invited me to this group on facebook that gives out a gas coupon. If you have a facebook, the group is at: related links
A fan group is a group someone made and invited certain friends. you can talk about it and everything.