It has happened, the social networks are now being used as a database for a search engine called SearchMerge. SearchMerge allows you to input your search keywords and then queries Twitter, YouTube, Flickr, FriendFeed, LastFM, Technorati, Vimeo and Google. SearchMerge allows you select from multiple popular social sites to get merge real-time search results. Like a search engine you get search results that will include rich media content with text, images, and video all appear inline and you be able to watch YouTube videos in the results time line and with tweets you can reply, retweet or view the full tweet.
Looks like the internet is going to be one big social networking site.