These are the top 10 musicians with the most number of "likers" on Facebook and followers on Twitter combined.

THE TOP 10
1. Rihanna - 95.9 million
2. Lady Gaga - 90.5 million
3. Justin Bieber - 87.0 million
4. Katy Perry - 84.6 million
5. Shakira - 81.3 million (+)
6. Eminem - 80.8 million (-)
7. Taylor Swift - 64.5 million
8. Michael Jackson - 57.2 million
9. Selena Gomez - 54.7 million (+)
10. Lil Wayne - 53.6 million (-)

*If ever your faves aren't included in the list but are eligible, just post the necessary stats so I can make the necessary changes.
*I'll try to update this list as often as possible, but there's no way I can easily keep up with the rapidly growing numbers.

OMG Rihanna

Where Selena Gomez she has 37 Facebook like and 13 twitter follow

Facebook : 37564090
Twitter: 13600000

Total: 51,164,790

Didn't they buy FB likes for Rihanna though?

Yes they did

3. Justin Bieber - 82.1 million

I don't know if its very accurate to simply combine numbers - many people use both an have liked/followed on both services.

Gaga is at #2 already and she has only been out for 4 years
Going to snatch the #1 spot with ARTPOP easily.

Just added her! Thanks by the way.

Carrie stays slaying with her 9 million total

lmfaoooooo clock ha

They also bought them for Gaga and Justin.

There's no way this list is "very" accurate, considering that there are a lot of fake accounts on both social networking sites too. But I guess this is the closest we've got into knowing who are the most popular in two of the giant social networking sites.

And that's when the likes and twitter followers started in full power anyway

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What's Britney's numbers? Her facebook likes are lagging behind...

And aren't 75% of her twitter followers fake?