San Francisco-based Klout has reportedly been acquired for $100 million by Lithium Technologies. The companies have not yet announced a deal, but online publications, including re/code reported last week that the deal is closed. Klout, which measures the influence of users on social media, has raised at least $40 million in known financing since it was founded in 2008, according to data from Thomson Reuters (publisher of peHUB). Funding rounds include a $30 million infusion in late 2011, although the company has reportedly raised more funding in what was believed to be a run up to an IPO. Investors include ff Venture Capital, Greycroft Partners, Institutional Venture Partners, Kleiner Perkins Caufield & Byers, Venrock and Zelkova Ventures. San Francisco-based Lithium is also venture-backed, having raised more than $150 million from Benchmark Capital Management, Emergence Capital Partners, Shasta Ventures and others.