Just on the topic of Pixel Dailies, I think its fully random what they retweet, Some of my tweets have been retweeted others havent been, also if you just look at the tweets they retweet, its not like they always have a set selection of artists. I don't believe they ever said themselves they only retweet select artists. You have to remember these guys are busy as well, they probably just try to retweet as most ppl as possible but don't want to spam everyone's feed.