7 tech revolutions that flopped

Wouldn't it be great if your friends knew where you were at all times?

No? Oh, that must be why social discovery apps never took off.

The premise of apps like Highlight is interesting: Arrive in a new city and instantly discover which friends (and friends of friends) happen to be around you. Get a notification that your buddy is at the same restaurant.

In reality, people don't want their location broadcast all the time -- for privacy reasons, and because that absolutely murders your smartphone battery. That's why Google (GOOGL) shuttered its Latitude app, and Highlight never gained any traction.