Questions about copyright

I recently finished an initial version of my app HaHrchives. It's essentially a voting platform for the funniest internet content, year by year. It also gives a little history for that content. As more and more posts get added to the site, I want to make sure that I'm not running into any legal gray areas. I'm aware of section 230, which protects against user generated content, but would like some specific feedback on if the images or videos on my site are some sort of violation. Thanks!