"At least 1 measure should use median instead of average:
* the number of friends per member
because there is a power distribution. If You are using average, the activity is strongly underestimated.
I am also not sure if average time to last visit…"
"Lika your start. It seems from your suggested KPIs that they cover many different situations och online environments.
- The membership measuerement is valid for formal memberships lika MySpace, groups in Facebook, Ning etc.
- Newsletter and…"