to chart with or without the help of radio airplay. This meant that a song did not need radio airplay to be eligible to chart on the Billboard Hot 100. With this policy change, a song could chart based on digital downloads alone. On July 31, 2007, Billboard changed its methodology for the Hot 100 chart to include digital streams. The digital information at the time was obtained from Yahoo and AOL's streaming platforms. This change was made exclusively to the Billboard Hot 100 chart. The effect of this chart change was minuscule at the time because it was estimated to account for 5% of the chart's total points. In October 2012, Billboard significantly changed the methodology for their country, rock, Latin, and rap charts, when it incorporated sales of digital downloads and streaming plays into what had been airplay-only charts. Another change was that rather than measuring airplay only from radio stations of the particular genre, the new methodology measures airplay from all radio formats. This methodology was extended to their Christian and gospel charts in late 2013. These methodology changes resulted in higher positions on the genre charts for songs with crossover appeal to other genres and radio formats (especially pop) at the expense of songs that appeal almost exclusively to core fans of the given genre, which was controversial with those devotees. On February 20, 2013, Billboard announced another change in the methodology for its charts that incorporated YouTube video streaming data into the determination of ranking positions on streaming charts. The incorporation of YouTube streaming data enhanced a formula that includes on-demand audio streaming and online radio streaming. The YouTube video streams that used in this methodology are official video streams, Vevo on YouTube streams, and user-generated clips that use authorized audio. Billboard said this change was made to further reflect the divergent platforms of music consumption in today's world. Songs All-genre Adult/Pop Christian Country Dance/Electronic Holiday Internet charts Jazz Latin R&B/Hip-Hop Rock/Alternative World music International charts Canadian charts Other international charts Albums Video Discontinued charts Notes Other charts In December 2010, Billboard announced a new chart titled Social 50, which ranks the most active artists on the world's leading social networking sites. The Social 50 chart tallies artists' popularity using their weekly additions of friends/fans/followers, along with weekly artist page views and weekly song plays on Myspace, YouTube, Facebook, Twitter and iLike. In January 2011,