This past week, the Teacher-Librarian group that I belong to put on its annual "welcome-back-it's-September" mini-conference. Our keynote presenter (Maryam Moayeri) is doing her doctorate on how teens use the web. She had some very interesting things to say about how poor teen searching skills are and how little time is spent considering search terms, and evaluating the usefulness of sites. Teachers and TLs need to show students how to find what they're looking for!
Here's a page from "that search engine" that explains how to get what you want and need.