This is for discussion later on.

We have been discussing the gamification of the platform to engage better the users by awarding them privileges. This is related to Activity page: https://www.beat-eu.org/platform/user/smarcel/?tab=activity

I recommend this very nice MSc thesis "Gamification in a social system": http://www.cs.rug.nl/~aiellom/tesi/blaauw.pdf

it describes various algorithms relying on graph -- and provides codes in appendix -- to model reputation with algorithms such PageRank and other. Another algorithm called LevelUp presents principles to award badges and build a leaderboard. The author is apparently a big fan of online games such as Call of Duty !

Here is also some interesting tips on Gamification in particular the tips 7, 8 and 9: https://www.td.org/Publications/Blogs/Learning-Technologies-Blog/2014/02/10-Best-Practices-for-Implementing-Gamification