A new study released today from Semiocast revealed that Pinterest has over 70 million users, and that 45% of new users from June were from outside the US. International users are quickly joining the social network, and these users could surpass the total American user-base in 18 months. Users in the US are far more active than international users, however, with 79% of users who pinned, repinned, or liked a pin during June 2013 hailing from the US. This means that although users are joining up abroad, the most active Pinterest users remain in the US.