Please Beware

Hi all
I have had the unfortunate pleasure of encountering some web-nastiness recently. It's taken the form of someone with a blank Yahoo profile named Mark Y, who has somehow gleaned personal information about me and my friends. This person is now using that information and embellishing it with misinformation in an apparent attempt to cause me grief via my friends.
I won't indulge this persons efforts by commenting here, the purpose of this blog is simply to warn my friends. Please check your Yahoo page security features and ensure that you are only allowing accepted friends to comment on your blogs. Please ask and I can provide a detailed written step-by-step for doing so if you need it. This is a good step for anyone to take in any event.
Furthermore, I would not in the least be offended if you removed me from your friends list. Of course, I would hope you could supply me with alternate contact information so that we do not lose contact!
Thanks for listening, let's be careful out there!