Websites and adds use things like tracking cookies adn spyware and that sort of thing to see what types of webpages you visit by checking your cookies or your 'bookmarks' or something, and based on that information they show you adds related to it. so if u have visited any websites on bipolar or have anything bookmarked then you will probably see more adds related to that then anything else. hopefully that makes sense and i didnt repeat myself too many times by accident lol