If you've ever wondered why Mark Zuckerberg hates Snap (NYSE: SNAP) so much, look no further than eMarketer's latest estimates on social media engagement across demographics. The figures show that Snapchat remains more popular than Facebook (NASDAQ: FB) and its Instagram service among U.S. teens (ages 12 to 17).The good news is that Facebook engagement remains strong across all other age groups, including millennials, Gen Xers, and baby boomers.Image source: Facebook.Continue reading