Like it or not, Instagram is going to start putting IGTV previews on your feed

You're about to start seeing a lot more content from IGTV, the long-form video service Instagram rolled out last summer that was meant s to be kind of YouTube rival, but which hasn't managed to gain significant traction so far. Starting today, Instagram is going to start shoving previews of IGTV content into your main feed, ideally hoping that you'll see something that sparks you to want to jump into IGTV itself -- and maybe even watch more videos there. Facebook, which of course owns Instagram,...