Basically, you'd get 3-5 daily missions every 24 hours (e.g. 'Post a meme using the "disaster girl" template in Fun'), which would help you gain extra Points (say, 250 for each mission). Also, I think the Points should count towards a level system where, say, 10000 Points would equal 1 level. This level system would be much easier to keep track of, and more visually helpful.
A potential issue is that this would crash the site, especially for users such as Iceu and who_am_i, who have millions of Points. So perhaps the level system should be implemented for users with 500,000 or less Points first (equal to Level 50), to see how it would work.
I hope at least part of this idea is considered, as it would also appeal to younger users.