It hasn't even been sent to radio yet and it has been climbing on iTunes. Not everyone jumping to the conclusion that its a flop before its even promoted. This is the first time this era that there's been a song released as an official single AFTER the album came out so its going to take some time, just like ET, Wide Awake, and LFN did.
We can't doubt Katy just yet. It's not a wise thing to do in the best of circumstances, as we've all learnt. Don't lose hope at this point, we're still very early in Birthday's run.
I can't believe people thought that this would immediate shoot into the top ten with very little airplay and a lyric video this fan base is spoiled rotten.