Too often, that's what happens. But why not turn it around and let your students guide you into choosing the right tools? What tools/resources will help students most? Which is easiest for them to use?
Teachers can use foursquare to create meaningful, interactive, social, fun, and rewarding lessons and projects. Use foursquare to take attendance*. Students check in when they come to your class each day and earn badges the more they're there.
Create a science scavenger hunt on the 6th grade hall by sending out clues to help students find answers to some of the mysteries about Earthquakes and the challenges of predicting them. With every answer they find a new clue is revealed, the more clues they 'unlock' the more badges or titles they earn. Who wouldn't want to Mayor of Fault Line City?
Teachers create group projects where students 'check in' with their groups using foursquare and have the opportunity to interact after the school day is over. Students could also be encouraged to follow students from other classes working on similar projects to brainstorm new and better ideas.