Saritha Rai: This time last year, few had heard of Bhavin and his younger brother Divyank.
That changed when they sold their advertising technology company Media.net, with customers including Yahoo, CNN and the New York Times, to a Chinese consortium for $900 million.
A teenage entrepreneur who became a millionaire by 20 before sharing a billion-dollar fortune at 36, Bhavin Turakhia isn’t afraid to think big.
Now he’s putting $45 million of his own money into building a rival to Slack and other office messaging platforms.
Flock, a cloud-based team collaboration service, has attracted 25,000 enterprise users and customers including Tim Hortons, Whirlpool and Princeton University.
It’s a market that has already drawn interest from…