The three juggernauts of the social video scene are doubling down on advertising technology to keep advertising monies flowing through their respective platforms. This week, both Facebook and Snapchat announced they’re beefing up advertising solutions; and their announcements follow one made last week by Google to do the same. The social video platforms are looking to cash in on declining linear TV viewership, which has left marketers looking for new platforms upon which they can engage viewers and reach audiences, and the surge in mobile video usage. In the mobile world, Facebook (and Instagram), YouTube and Snapchat rule. Facebook said it wants to give marketers more precise data about advertising on its platform, and has expanded partnerships with three ad…