Google's pretty good at finding most things. I find that by searching round subjects it'll usually turn up anything that's actually there to be found. People however, are a bit more hit and miss. If you're looking for an old friend or colleague or ex-band member, try one of the services that are specifically designed to search what's sometimes called the 'deep web' - those bits of the Internet that traditional search engines skim over. Try something like 123people or Yasni or Pipl. All have got something to offer and may just track down the person you've been looking for. These and other sites will appear in an article I've written for Web User.