Facebook allows its users to add location to their posts. You can for example share your current location with your friends or simply describe where a photo published in a Facebook post was taken.
How to add location to a post? Login to your Facebook profile and create a new post. You will notice the presence of 4 small buttons below the What's on your mind? field. The first button allows you to insert a picture in the post while the second one allows you to tag people, the third button allows you to enter a mood message and finally the last one allows you to enter add your location to the post:
Type your current location in the Where are you? field and then click on Post: