#4. Justin Timberlake's venture into the world of social media.
You know who probably wasn't happy to see Jay Z rubbing elbows with Zuckerberg? JT! He bought a large stake in MySpace a couple years ago and recently relaunched an updated version of the social media site. So he couldn't have been happy to see Jay spending time with Zuck. But maybe Jay was just asking him for some advice for JT here. Yeah, that must have been it. Way to be a good friend, Jay.
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