This is commonly used for hashtags on twitter to be able to specify something in a short format.
Also can mean that you will write something else about this topic.
Friend 1: I am about to go see #HungerGames. What do think about it?
Friend 2: I am going to go see it tommorrow, so don't give anything up. MyRP on how good it is.
This company "Insert Company Here", looks really good by this article I read. #MyRP