Hi Careasa,
No, these spammers do not manipulate posts already posted, nor have I known them to "steal" information, email addresses or the like. These seem to be automated messages with links attached that are annoying.
They don't happen very much or that often, but it just irks me when we get posts that say "xnvmwwerjhfksd" and there is a link to some unknown subject.
Just trying to keep this site protected!
Hope that helps. Have a great weekend,
Carol