App Locker | Windows Phone Apps+Games Store (India)
this app creates a mock tile which enroutes through the app with password lock.
actual app is not locked, just the new tile created in this app asks password. original app can be launched from app list without password.
nonetheless, apparent security is there. most of the common social networking apps are currently covered. hopefully, more to be added soon.
it's a free app, and when u create first tile, it asks u to purchase premium app. it is also free (currently), but it looks like that the design is made so that in future, charges will be applicable.
till now, i never thought about this idea. it's just a similar concept of creating mock tiles (shortcut tile), like we have seen in recent past for creating transparent tiles and icons.
awesome idea.