The Vine app was initially available only for iOS-based devices (Apple), but launched a version for Android OS last June. At the time of the Android launch, Vine had 13 million users - which means that its gained another 27 million in just the last two months.
“We’ve said this before and we’ll say it again; this community – now more than 40 million of you – is amazing. Thank you for inspiring us,” Vine tweeted.
Source - Twitter's Vine video service reaches 40 million users, redrocketmedia