Having just returned from a family trip to Europe, I've come to value even more sites like TripAdvisor and Yelp that let users rate and review restaurants, tour guides, and more. Sites like these were particularly helpful in Europe where there seems to be two kinds of customer in every town: The locals who know everyone and the tourists who know no one. We fell into the latter group, so finding good restaurants and attractions required good recommendations and referrals.READ»