Lady Gaga because of her infamous Carly Rae Japsen tweet and that she promised a meeting with a fan who bought the most copies of Applause.
Rihanna because she Instagrams or RTs every little achievement like ''Best Shapes Given to Weed Smoke''.
Katy (and her team) because we have recently been informed by Billboard insiders that she is releasing mediocre singlesbecause she is on tour and can't promote them now, but still wants the radio keep playing Katy and she saves the most-potential hits for the time when her tour schedule is slowing down.
I can't name Miley because she makes it obvious that she wants attention. It's not like she supports ''music no the bling'' idea and acts the opposite.