If I can copy and paste what you're thinking, then yes. Otherwise, nope. Too hard to tell what's underlying the code in the case of a search engine, machine learning or artificial intelligence system. Large difference between the code behind intelligent algorithms and text entry boxes with DB calls.
BBSs, TheWell, Compuserve, Prodigy, AOL, TheGlobe, Geocities, Friendster, MySpace, Facebook, what's next? Fill in the blank I guess.
DMOZ, Yahoo, HotBot, WebCrawler, AllTheWeb, Excite, AltaVista, Lycos, Google, what's next? Too hard to tell.
Google was founded on principles in artificial intelligence and now has a good handle on how to implement portions of AI along with all the other things they're doing.
Facebook was founded by a guy who was a voyeur and called its users "dumb f*cks" for giving out personal information while rocking a biz card that said "I'm CEO, bitch!".
Facebook today is equal if not more complex than Google. They process a huge amount of user data and it's all searchable. The relationships in that data are much more complex than in web search results.