I just got banned from liking pages on Fb - I have ONE like. Why?

[Kathrynne]

I hardly use Facebook and log in once in a while, exclusively for staying in contact with friends that are out of the country. The last thing I posted was last year and the one like I clicked was months ago.
It's not that I miss this feature very much. But I'm curious. If Fb 'thinks' I'm not using it's features enough wouldn't a ban like this be ridiciulous? Or is my account compromised? Has someone reported me? I've checked everything (as far as I know) and all seems to be normal.

Btw: I've been banned for 30 days. I've read that this is one of bigger 'dententions'. But everyone who reported being banned did at least like a lot of pages.
I just checked my activity log and there seem to be mass likes for websites I never visited, pictures of people I've never seen and mostly in languages I don't speak or even identify. What is this?
@Daniel
That's what I thought. I already changed the password and deleted all activity. The ban has actually already expired as it was issued weeks if not months ago...

Thank you

[Daniel]

Somebody Probably Hacked your Account and Liked Lots of Different Things Change your Password and you have to Wait Til the 30 Days Are up Before you can Like More Pages Sorry that Happen to you