Wrong!
Activity updates only if you make atleast 1 post in 2 weeks period. It is same for trust rating, it will only increase if a person from DefaultTrust list or on a user's trust list put a trust feedback.
-MZ
we are saying the same thing!!!!
the rule that you said is correct.
https://bitcointalk.org/index.php?topic=177133.0check at the bottom of the page.
but the activity counter according to the rule that you said,
is updated automatically by the engine forum!!!
that's all!!!

for the trust counter is different.
a user has left a positive feedback to you!