You are awarded points for making a certain number of posts, a certain number of likes etc. They're just a bit of fun to try to encourage members to visit and use the forum regularly.
You will notice that we can award each other trophies, usually for getting a great HbA1c result but also when a smaller milestone has been reached such as a lesson learned or goal set or even for making a salient point in debate. It is members ways of rewarding each other in a fun and supportive way.