Comment by berkimbayev

Interestingly, most users try to provide as much information as possible, to increase the score and grow higher in rankings. Then, other users try to catch up. The system basically regulates itself. When all activities are added by all users, we end up with the objective ranking making all users agree. Especially if they know each other (e.g. classmates or co-workers). But real life doesn't stop, and the rankings are always changing because of new information.