I've been getting emails like this:
Our site has been penalized by Google because of a handful of back links pointing to our site (we have lost 80% of our traffic). I have opened a line of communication with their WebSpam team and am working to clear the penalty. HOW THIS AFFECTS YOU? We have isolated the back links causing our penalty which we need to have removed, ONE is from your site and I need to get that link taken down asap. Heres the thing... In order to get out of the penalty they have asked me to submit to them all the paid or unnatural links which are currently pointing to our site and in the next 30 days I will be submitting to them this list and unfortunately your site is included. HOW TO AVOID NEGATIVE ACTION FROM GOOGLE If you can take the links down to hisdomain.com then of course I will be able to leave your site off that list. I really don't want to be the cause of a penalty to you, nor report anyone else's website to Google hence I'm reaching out to you now, and if you can get that link taken down ASAP then of course I won't include your site when I report back to them!
Do Google request such lists and can this cause a problem for my SEO? (of-course I have no idea who this is and have never sold a link to him or anyone else for that matter on my site, it's just User-Generated-Content)