Rihanna's Instagram Return Sparks No. 2 Re-Entry on Social 50

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Rihanna poses at the Chanel 2014/2015 Autumn/Winter ready-to-wear collection fashion show on March 4, 2014 at the Grand Palais in Paris. 

Badgalriri -- Rihanna's handle on Instagram -- has been absent from the Facebook-owned photo-sharing platform all summer since her account was deactivated in May. While no official explanation was offered, some say it was because of posts containing risqué images from her Lui magazine cover shoot.

Either way, Badgalriri reappeared Nov. 2 on Instagram, spurring a No. 2 re-entry on the Social 50 after a five-month absence from the chart's top 10. The surge back onto the chart also elevates her on the Billboard Artist 100, where she flies 100-44.

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Rihanna's activity on Instagram is one of the primary drivers of her activity on the Social 50, where she's spent 21 weeks in the No. 1 position since the chart's launch in 2012. This explains why the account's absence is responsible for such a dramatic drop in her standing on the chart.

On the week of her re-entry, she came back with a bang, posting more than 20 photos before the charting week's end (on Nov. 9) that garnered 14.5 million reactions. The news contributes to the 109,000 mentions of her on Twitter (up 6 percent) and a 10 percent increase in traffic to her Wikipedia page for the week.