Why do ads always appear as my Facebook status update?

[Shane]

I deactivated my FB recently but it keeps reactivating itself!
Whenever FB think I am active again, (whenever my account is open for others again as if I'm still on FB) an ad appears as my status update. But the thing is, I never even wrote any of it down.
For example, sometimes my status is updated saying "lose 21 lbs in 18 days" blah blah blah.
Or another status I keep seeing is something about a credit card.
Anyone know why this is happening. I'm tired of these status updates appearing as me and that's why I deactivated it.
And also if it's possible, do you know how to stop these ridiculous ads coming up as my status?
And also, does anyone know why my account keeps getting reactivated? No one knows the my information so idk why I keep getting emails saying it's reactivated?