Does Facebook Own You?

I do not enjoy writing every post relating to facebook, but this time facebook is simply getting on my nerves. Who do you think owns data on facebook? You, the community owner/page owner or facebook?

Look at this scenario:
I’m of of the admins of a community of “4000” odd students working on “A Powerful Vocabulary” concept on “facebook groups”. Amazing interactions/discussions happening all over. One fine day you login to facebook only to see a warning:

The group “Group Name” has been removed because it violated our Terms of Use. Among other things, groups that are hateful, threatening, or obscene are not allowed. We also take down groups that attack an individual or group, or advertise a product or service. Continued misuse of Facebook’s features could result in your account being disabled.

What do you think? This has happened in real today with me. Facebook had deleted the group without any intimation. Who is responsible for the loss of all the data now? Please add your thoughts in the comments.

PS: Any sort of help greatly appreciated. Thanks in Advance.