Astroturfing on Stack Overflow
User jaimeiniesta has been posting links to his website on practically anything related to w3c-validation. Some of them aren't even answering the question (ie How to setup W3C Unicorn validator for local URIs?), just posting the site as a way of performing w3c validation.
To me, it looks like he's attempting to use Stack Overflow's high search engine ranking to boost his own ranking. Should I flag all the answers, or just the obvious ones?