The Scrub Board

[MkLovin]

I have a good amount of newbie questions for you all, if you don’t mind spending the time answering them! I did a bit of research to learn more about MMs... ARCA, NITE etc... I found these links and I have a few questions about the information that is posted on it...

http://www.marketmillionaires.com/stock-analysis-school-fundemental-technical/7183-market-makers.html

First, what is the difference between wholesalers (NITE, SCHB), retailer (TDCM), retail ECN (ETRD) and an ECN (ARCA). What does ECN stand for in the first place?
It is my understanding that anyone can be a MM, this is correct right? So all of the abbreviations listed above are merely companies that people use to manipulate the market correct? SO, if all of this is correct then I could be a MM and the abbreviation for my brokerage would show with a large order... Just wanted to clear that one up.

Second: where can I view the monthly share report? Is this a filing? Does anyone know where I can view a level 2 for free w/o a 20 min delay or one that is relatively cheap?
ONE MORE!!! I read that you can’t short on the OTCBB... This sounds like misleading information... Can anyone clarify?
Hey, thanks for all the help, and I appreciate you all daily!!! GLTY