Just like Google and other search engines, Facebook has some built-in power search tools and terms to help you find people. Want to search your Facebook network or friends list, but you want to narrow the results to fall within an age range? Just enter a term using the “name,” “y1″ and “y2″ search filters.
For example, suppose you wanted to find your buddy Colin from college, but can’t remember how old he is. To find him, just enter in “name: Colin Bauer y1: 25 y2: 40” and voila! The search string asked Facebook to look for people named Colin Bauer between the ages of 25 and 40.
You can also use two search terms at once by dividing the terms with the “pipe character” (|) (the pipe is found on the same key as the backslash).
If you want people to easily find you when they search, fill out your profile as much as you can. That way your profile interests — music, books, movies and so on — will move you closer to the top of Facebook search results for those keywords. Check out Facebook’s help page for more handy search terms.