With the Trump administration turning against the Chinese-owned video app, Microsoft looks for an opportunity to step into a young social media base. Perhaps most attractive to Microsoft is that the scale and growth of this app might allow it to compete with Facebook, which is currently facing regulatory scrutiny. Per the article, TikTok gained 315 million users in the first quarter of this year; more than any other app has managed in a single quarter. This brought its total user base up to 2.2 billion globally.