Ariana Grande Dethrones Justin Bieber Atop Social 50 Chart

Ariana Grande performs onstage at the 10th Annual Delete Blood Cancer DKMS Gala at Cipriani Wall Street on May 5, 2016 in New York City.

Grande returns to No. 1 for the first time in over a year, while Bieber loses the top spot after a 56-week run (159 in all) at the top spot.

For the first time in over a year, Justin Bieber isn't No. 1 on Billboard's Social 50 chart, as Ariana Grande rises 3-1, bumping Bieber down to No. 2. It's her first week at No. 1 since the June 20, 2015-dated chart, and her eighth week atop the list in total.

The Social 50 is powered by data tracked by music analytics company Next Big Sound and ranks the most popular artists on Facebook, Twitter, Instagram, YouTube, SoundCloud, Wikipedia, Instagram, Tumblr and Vine. The chart's methodology blends weekly additions of friends/fans/followers along with artist page views and engagement.

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Bieber's rule lasted for the past 56 consecutive weeks (of his total 159 weeks atop the list -- the most of any act).

Grande stole the spotlight from Bieber as she gained 167 percent in YouTube reactions and 95 percent in Twitter reactions in the week ending Aug. 7, according to Next Big Sound. During the tracking frame, Grande released a lyric video for her latest single "Into You" (which doubled as a live performance) and a remix for the single featuring Mac Miller. In total, her chart points rise by 26 percent.

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While Bieber was much discussed on social media during the week -- thanks to his latest nude photo drama -- his drop from No. 1 is owed to his personal lack of engagement on social networks. Bieber took a bit of a vacation on social media during the tracking week, posting less than half the amount of posts he normally shares on services like Twitter and Instagram. (He's traditionally a prolific poster on social media.)

In turn, that limited users' interactions with his content (he's down 19 percent in Twitter reactions, and collapses 61 percent in Instagram reactions), enabling his fall from No. 1.  It's the first time Bieber has not been No. 1 on the chart since the July 18, 2015-dated ranking, when Taylor Swift led and Bieber came in at No. 2.

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