Top social travel apps
The newly launched Trippy app (free; iPhone) uses your existing social networks, such as Twitter, Facebook, and Foursquare, so your friends and family can help you chart your travels by sharing their tips for affordable places to stay, dine, and shop along your route.
Gogobot.com, meanwhile, is a travel-focused social network where you can interact with other members. Having trouble booking a reasonably priced hotel in Rome? Just post a question and see what the Gogobot community comes back with.
On the Gowalla app (free; Android, iPhone), users have created their own city guides. The personalized lists are often quirky (Berlin’s Best of the Wurst) and offer options for inexpensive finds (Happy Hour Bargains with Local Fare, in Austin).