So, that's why I'm not on the list? Because I curse too much?? 
lol Sorry! It's just my personal DA list, honestly. It's how I keep up with DA related stuff, and sometimes I keep in touch with Cullenites that way (usually when I'm on my iPad and can't bother coming to the forum and typing up long replies, as is my wont). I actually follow a lot of Cullenites who aren't on "the list" for various reasons, none of which is "I really do not like that person"... promise
I sometimes post the list here for people like Vamp who are looking for a way to keep track of DA-related news. If anyone wants to steal my list members and make their own DA list, then by all means, do! Pimp your list out here in the thread! Maybe someone wants to start and share an "only Cullenites" list. That would be great. But again, this is just my personal list. If you don't post much, if you post mainly about DA/ME, and/or if I find myself retweeting/replying to you a lot... I add you to that particular list.
The point of a list (for me) is to keep it small so I can quickly scan and catch up on stuff that I missed while I was gone. I don't have a smartphone, hence why I need the list. I can only check Twitter when I'm at home and have internet access (aka my laptop or iPad).