pm's are sent to convery personal thoughts to the people concerned. Offcourse this is a public forum and should be treated as such, but it does allow you to communicate privately otherwise we wouldn't have the pm option.
As far as positions/core team is concerned, going by your number of posts, I would imagine you to be a new comer and hence the following explanation, otherwise I would ask you to RTFM.
The core team was set up about 4-6 months ago, which consists of the most active members on the forum, who share a common cause to reduce backlogs. We try to co-ordinate strategy on a national level and make sure we are all on the same page. We were supported by Rajiv Khanna (the person who owns this site), in our activites and he acts as our unofficial advisor in various campaigns that we run, on the basis of him being an attorney and the vast experience he has in this field. The core team also acts as a point of contact between the community and Rajiv, we do bring up issues that require his input and draw his attention to cases where his intervention is required.
To facilitate good communication between the 15 odd members of the core-team, we devote a part of our weekends in conference calls (that Rajiv attends), and discuss issues at hand. We also do other work like making appointments with various congressmen/faxing letters/spreading awareness of the cause and generally keeping track of the INS and its doings.
There is total open communication, as you will see from various threads in other forums on this board. It is not possible to reproduce the thread in every forum due to software limitations. You are welcome to see how the core team thinks, the minutes of our meetings, etc. on those threads.
And you are welcome to join the core team if you have the enthusiasm and drive to do so.