Development of Pinterest began in December 2009, and the site launched as a closed beta in March 2010. Nine months after the launch the website had 10,000 users. Silbermann said he personally wrote to the site's first 5,000 users offering his personal phone number and even meeting with some of its users. The launch of an iPhone app in early March 2011, brought in a more than expected number of downloads. The Pinterest iPad app was launched August 2011. Pinterest Mobile, launched the following month, was a version of the website for non-iPhone users. Silbermann and a few programmers operated the site out of a small apartment until the summer of 2011.