How to use the new Facebook Mobile check-in (location) function

As facebook upgrades its features on the desktop version, there's lot of change in the mobile version also.
Facebook check in first started with placing a nearby location in status updates.
After, it got more advanced features using the "in location" or "at location" immediately after your status.
This brought a huge complain from facebook mobile users as it is fun to share your nearest location along with your status update.
Now,