SocialFlow is a social media optimization platform for leading brands and publishers. The company uses the Twitter firehose, click data derived from its proprietary link proxy, along with proprietary algorithms, to optimize the delivery of messages on social networks. The company believes that understanding and utilizing key metrics of engagement, such as clicks per tweet and clicks per follower, is central to growing a large and active social media following. Their analysis and data visualization of the way news filtered out around the death of Osama Bin Laden via Twitter received international news coverage and led to questions about the role of Twitter in journalism. SocialFlow was founded in early 2009 by Frank Speiser and Mike Perrone, who sought to apply a scientific approach to the task of building and sustaining engaged social media audiences at scale. SocialFlow announced April 7, 2011 that they had raised $7 million in Series A funding. The Series A round was led by Softbank, with Softbank NY, RRE Ventures, betaworks, Highline Venture Partners, AOL Venture Partners, SV Angel and a group of high profile angel investors participating. On April 16, 2013, SocialFlow announced they raised $10 million round in Series B funding. Fairhaven Capital led the round and was joined by existing investors SoftBank Capital, RRE Ventures, AOL Ventures and Betaworks, as well as new investors kbs+ Ventures and Rand Capital Corporation.