Twitter says Vine app has 40 million users

Vine, which was acquired by Twitter almost a year ago, has hit 40 million users. The company announced this milestone via a tweet earlier today. I was initially skeptic when Vine launched in January this year, but the app (which allows you to make six second videos) has genuinely emerged as a new kind of video art form and has even created its own set of Vine video stars.

Why do videos go viral on Twitter?
If you were wondering how and why videos go viral, Twitter has the answer for you — it doesn’t really know. “There are no rules to “virality” — while some ignite, and spread like wildfire across the web, the growth of others is much more measured, like ripples spreading across a lake,” the company wrote in a blog post Monday. Bottom line: after all these years, content popularity on the internet is like playing the lottery — hey, you never know!