Justin Beiber, Katy Perry and Twitter's Biggest Risk
*Canada's pop star Justin Bieber performs in concert during his Believe world tour in Buenos Aires, Argentina, Sunday, Nov. 10, 2013. Bieber's manager says food poisoning made him quit the stage during the concert, drawing boos from a huge crowd in River Plate stadium. (AP Photo/Pablo Molina, DyN) · The Exchange

This week the Shots of Me app for iOS launched in the Apple (AAPL) iTunes store. It looks enough like yet another variation of an Instagram clone that it's hardly groundbreaking. Sure, it's somewhat notable that users will be limited to selfies, but even that twist has  been done before (see Selfie.im).

No, RockLive’s Shots of Me app is not anything extraordinary in the least except for the fact that mega pop star Justin Beiber is an investor, reportedly kicking in $1.1 million. And for the most part, the tech media and blogosphere has yawned the launch off with just a few articles here and there, many of them focusing on the Bieber angle.

Maybe their general neglect is appropriate enough. But perhaps the larger press is missing the implication here and that is this in a world where celebrities are responsible for a disproportionately high percentage of engagement on social media, it will only be a matter of time before the stars themselves figure out how to disaggregate the largest sites and capture more for themselves.

Twitter ruled by pop singers

According to Twitaholic, the top three Twitter (TWTR) accounts by followers collectively have more than 135 million followers and all three are pop singers. Katy Perry and Justin Beiber have about 47 million followers apiece and Lady Gaga has more than 40 million.

In fact, seven of the top 10 Twitter accounts by follower count are pop singers, and they have in sum 266 million followers. Widen the lens further still and you'll find the vast majority of the top 100 on Twitter, by number of followers, are celebrities.

This makes sense. Celebrities have millions of fans, a growing number of which are on Twitter and Instagram, and they love to closely follow what their favorite stars say and share.

Collectively, celebrities are in no small part responsible for Twitter and Instagram’s massive engagement. Its not unreasonable to imagine, especially as the two ramp up monetization strategies, that some big stars might want to collect a share they feel entitled to based on the content they provide and traffic they attract.

The cash for content strategy is not in the least unusual. Google’s (GOOG) YouTube has a well-developed partner program in which content creators who upload videos share advertising revenues.

Further, as the technology continues to advance quickly and apps become faster and cheaper to build, some of the biggest stars might get the idea to create their own social applications for their fans, making the immediate sharing experience and control even greater.

Twitter acknowledges migration risk

In the section titled Risks Related to Our Business and Our Industry of its S-1 filed with the Securities and Exchange Commision prior to its recent IPO, Twitter acknowledges the loss of valuable content is a risk to the business: