If you’ve been paying much attention in the social media sphere, you’re likely aware video has become a popular—and highly engaging—form of content across all major platforms. As a result, smart brands now consider it an integral part of their social media marketing strategies. But if you’ve experimented with video in social, you may have noticed that successful YouTube content often tanks on Facebook. Or maybe you’ve wondered how your Instagram videos should differ from your Vines. Your videos must …