>This seems like a dumb move, why would MS want to get tied up in the horrors of social media when they have such a profitable empire.

They bought LinkedIn, which increasingly resembles a niche social media for professionals, all the way down to a news feed that is increasingly filled with motivational junk

Then there's Github, which used to advertise itself as "social coding".

Microsoft has done plenty already to get their foot in the door of social media.