The trailer just didn't do much for me.
The constant jump cuts made it hard to figure out what I was even looking at half the time and then you mix in the tik tok videos...
I'm telling you right now that, just like you being able to listen to music through the radio stations, you will also be able to use your in-game cell phone to watch various in-game pre-created tik tok style videos. I bet they even factor in to some missions as well. I do not think there will be a mechanic where you can create those videos and post them for "likes" but who knows.
Just like the stock market in previous GTA games, that would actually be pretty cool if it used AI to rank your videos, as you try to become an influencer and make money that way.