Whisper, a Los Angeles-based secret sharing/anonymity social social platform today announced that it had raised $21 million in new funds from a group of venture capitalists led by Sequoia Capital general partner Roelof Botha, who in the past had backed YouTube and Tumblr. GigaOM had first reported the news of Whisper’s funding in July 2013. At that time, we reported that company was raising about $15 million in its Series B round of funding. A report in Techcrunch puts their valuation at between $75 million and $100 million. In our earlier report, our sources put Whisper’s valuation at $100 million.