Bijan Sabet, a Tumblr director who is a general partner at Spark Capital, is optimistic.

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Partner Bijan Sabet for example had previously spent ten years in Silicon Valley and is regularly in Silicon Valley.

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Knowing he was out of his depth, Seibert turned to one of his own investors, Bijan Sabet of Spark Capital.

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The larger fund is partly so that the firm can make selective larger investments when an opportunity arises, says Bijan Sabet, partner at Spark.

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"Almost all of our companies are looking for Android and iPhone developers, " said Bijan Sabet, a general partner at Spark Capital, a Boston venture capital firm, whose portfolio includes Twitter Inc.

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Bijan Sabet, our lead investor, is somebody who back when I was running my little consulting company, before Tumblr, we were a little software company called Davidville and I was working on a bunch of start-ups at the time, a couple start-ups that got funded both through Spark Capital and Bijan.

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