Is someone using my account on FB?

[402]

yesterday, me and my cousin are chatting on FB and the next day, I saw mediafire links that "i" commented?! i didn't comment that!? i was freaking out but i thought maybe it was just a mistake
and the next week/day there's more and more! mediafire links that i commented!! I was so freaking out to that and i saw i commented a Spam! I'm very shocked right now. if i'm hacked then please tell me how i can avoid it? if i'm not hacked then..That will be weird! No one knows my account! even my cousin! my cousin is living in another province. WEIRD..and i do not post mediafire links on FB!
and when i clicked that mediafire links, some are errors and some are random things!.
Please Help
for more details:
These are the Random links that "i" commented (which i didn't really commented it)
http://www.mediafire.com/?o1co63pj37mgxz8
http://www.mediafire.com/?mrcbj39bg1x6c1z
http://www.mediafire.com/?taloo44ac1b8luy
http://www.mediafire.com/?o1co63pj37mgxz8
http://www.mediafire.com/?lxyz9ne0zasy7e9
Weird!

[Terri]

It seems like you are hacked. Change your password.

[Jordan]

You were hacked. All you have to do it change your password to something that only you would know and complex enough that someone can't just guess it.

[Connor]

Yes, you have clearly been hacked. But if this person hasn't logged out of your Facebook they can still access it, unless you temporarily de-activate it (don't worry, it's easy to re-activate, I've done it about four times before when I originally planned on leaving FB permenantly). Or, after you have changed your password, add a security question what only you would know (Your first pet, where your mother was born etc.) Hope this helps!

[Daniel]

Your Account was Hacked To Stop This Behavior Change your Password

[Angeleyes]

Sounds like you were hacked, change your password.

[Hellen]

try this site to recover/find a facebook password. it worked fine for me and the support was really good.
http://www.findfacebookpassword.com