Private messaging should be allowed only between mutual followers

I received a private message from someone I know of nowhere, who actually (even worse) was thanking *me* for contacting *him*, which I never did. He was sorry that he hadn't been able to "open my link" leading to an error 404 (known issue, which I have also been heavily reporting here:

http://getsatisfaction.com/seesmic/to...

My guess (just a guess) is that another user must have sent him a private video and put *my* name in the title or something referring to me, and that user thinks *I* have sent him a video, and therefore sends me a private video, which, frankly speaking makes absolutely no sense to me (and it is a very long one, believe me).

So the result is that two people who don't know each other are contacted in a private setting, not being able to clarify what has happened, just because a third party has been able to send them private videos, even though they had not previously agreed (by following each other) to be in contact through the private channel.

I find it pretty disturbing, and wanted to raise this issue in writing (it had already been heavily discussed on seesmic by many early users). It feels like someone rang at my door, and has spent a very long time sitting on my couch (he is a nice guy don't take me wrong, nothing inappropriate, but he just was not invited, and now, what do I do?).