You could do 1920x1080, and any social media service should be able to take that size video.
Action and title safe don't matter much any more. They were important when designing for CRTs, where a significant amount of the scan lines would go outside of the area of the glass. But, you could come across an LCD TV that was scaled to crop into the image a little bit. Even those only crop little bit off.
Here's an article on the topic, and he's still trying to be cautious:
Display Action / Title Safe Zones | Larry Jordan
For web video he's suggesting using the 5% thick action safe borders, but that text will be ok as well, no need to have a 10% border that represents title safe.
For your animation you could have a layer with lines on it, that come in 5% from each edge. Here's the Properties panel showing the location and size of that shape:
