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It was inevitable the moment Facebook let any old Internet user sign up to stalk friends, acquaintances and strangers. The social network is now opening up its walled garden to the masses — and the Web. Unregistered guests will be able to search through limited profiles from the site's homepage, and soon Google and other search engines will start indexing the site. A sensible ploy by Facebook, of course, to boost traffic by getting your second cousins, great grandmother, and neighborhood bully onto Facebook's site, without the bother of registration. Facebook is giving its users a month to set their privacy settings and limit their ability to be found. You may be able to control what unwelcome visitors see, but that doesn't make them any more welcome.