I don’t have a Facebook account.
If Facebook has been harassing you with messages that seemingly came from me, please take it up with them.
I should have received an e-mail when somebody registered an account under my e-mail address. Evidently, either the FAQ lies, or I threw the mail to the spam bin ages ago and forgot about it. The latter is more likely, but that does not excuse websites from applying a simple “confirm before use” policy.
Update: What makes me even angrier is that whoever registered under my e-mail address was able to see my list of potential contacts.