Observation 1: Many, if not all, of the members are friendly.
We'll keep it that way 
BTW, why do you say "not all"..? As much as I know, all the members are friendly.
Observation 1: Many, if not all, of the members are friendly.
I take that to mean "everyone, except for a few"...
I've heard a lot of things that happened in the past...
For instance, TED...
He's not friendly at all...
But he's permanently banned, or so I've heard...
Also, keep in mind that I don't know everyone here...
Anyway, observation 2 added to the first post...