Group is very active. I think they require people to physically show up to their Startup Monday event to be added to the group. Ping me offline and I could connect you to the group organizers. Or tweet them at: http://twitter.com/startupshk
I'm one of the founders. For the FB group we try to keep it the immediate community active members. Send me a message on FB and let me know who you are.
One other problem we run into on FB is that people use random photos and user names so we have no idea who half of them are, even if we have met the people before.