Facebook blocking random people, but not all when deactivating account?

[Unknown1]

A friend of mine couldn't access their Facebook account, so they sent an email to FB asking for all their friends to be blocked from seeing their account. Now, some have been blocked and some haven't. Also, their account is sometimes visible to the ones who haven't been blocked, but not always.
I just want to know if it's possible or it's something they did, blocked some people and is occasionally reactivating their account. The whole "Facebook has its own power and acting crazy and I have nothing to do with it" seems a bit far fetched to me.

[Daniel]

Facebook Does Not Block Random People and Its Not Possible To Get there Account Blocked For there Friends Not To See you Have to Have your Account Deleted In order For The Account Not to Be Seen People Deactivate there Accounts or Facebook Disables There Accounts For Violation of the Terms of Service But thats It