I want to know the answer to the following question:
Which music chart said in 2013 it would start taking youtube data into account for its ratings?
All the background I'm provided with is that "While YouTube's revenue-sharing "Partner Program" made it possible to earn a substantial living as a video producer—its top five hundred partners each earning more than $100,000 annually and its ten highest-earning channels grossing from $2.5 million to $12 million—in 2012 CMU business editor characterized YouTube as "a free-to-use... promotional platform for the music labels".". Is that enough to answer the question?