Yahoo-owned Tumblr's Founder David Karp uses Gmail

Yahoo-owned social networking platform Tumblr's Founder David Karp reportedly uses Google's mail service, Gmail. This comes after it was observed that the layout of the email Karp sent to his employees, regarding his resignation this week as the company's CEO, was that of Gmail. According to a Twitter user '@caspararemi', Google Apps also service the email accounts of Tumblr's employees.