High-school dropout and Tumblr founder David Karp is doing a presentation today at the Eventoblog conference in sunny Sevilla, Spain. In one of his first slides, Karp shared some statistics about Tumblr, which appears to be growing pretty well, pretty quickly.
Last August, the Tumblr team shared some growth statistics and claimed 50 million visitors and a healthy 255 million impressions in July 2009. This month (which I reckon is not actually this month but rather October), Tumblr self-reports 20 million unique vistors and 420 million impressions.
This means either Tumblr lost about 30 million unique monthly visitors in the past few months, or there’s some mix-up about what’s being measured exactly and shared publicly (visits vs. visitors, perhaps?). But third-party measuring services like Compete acknowledge that traffic numbers are definitely heading in the right direction.
According to Karp, Tumblr is currently seeing 2 million Tumblr bloggers publish about 40…
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