User participation often more or less follows a 90-9-1 rule:

* 90% of users are lurkers (i.e., read or observe, but don't contribute).
* 9% of users contribute from time to time, but other priorities dominate their time.
* 1% of users participate a lot and account for most contributions: it can seem as if they don't have lives because they often post just minutes after whatever event they're commenting on occurs.

Eh oui, l'ami Jakob se penche sur la participation au sein des communautés en ligne...

Eh ! Toi là bas, dans le fond... Lâche ton comm' !