What do you get when you mash together Instagram, Vine, Flipagram, and Musical.ly? TikTok. My middle school students introduced me to TikTok this past school year when I noticed that my 6th grade girls were glued to it during recess.  Fifteen second videos that you can add music plus filters, stickers, text, and more. Here’s what the Heavy says about TikTok – it’s a: “global music and video platform, it was created in 2016 by Chinese internet technology company ByteDance.…