Okay, thanks for your reply.
Here is the message I want to convey:
This is probably not a pure social group (yeah, it's a good idea to hang out with fellow traders for drinks, but that's probably another thread).
This is more of a "study-group" type - a group of highly motivated people who want to discuss and help each other about HFT.
Given the nature of HFT, it's probably more oriented towards IT people. We will discuss technical solutions to challenging problems in HFT, etc.