Well, quite a few people are still active on MLN. However, it seems that it is dying down now.
It's still a mystery.
Visit Lego message boards and go on My Lego network. Lego network rank help and look for how to get to rank 1.
You had to be a Lego club page member, but my Lego network replaced that. (that was dumb)
You can only get it if you had a file in 2005 and then moved on to My Lego Network. If you made an account before or when they switched to My Lego Network, they would give you the badge. Other than cheating, there's no way you can get it.
I am mars256 and i have a jungle module on my Lego network.
the Lego tree moudle
LEGO newsletter and the Lego magazine.
They are networkers that are under construction (that means LEGO is still working on them) they will probably give you the brick master badge.
You Get a Life
Buy it!!
You buy them
at lego.com