Good for: Social-media–addicted vacationers
How it works: We’ve all fallen victim to the flurry of round-robin messages that inevitably occurs when trying to arrange a group getaway. This application allows friends to eliminate the overload by creating a trip, adding travel buddies, booking hotels and divvying up the cost among invitees, all within Facebook. Each trip gets its own page, with separate tabs for organizing the basic details (dates, times, locations), accommodations and car reservations, plus group discussion threads and photos.
Where it’s available: Facebook