In the US, if I publicly disclose my invention on the internet, can someone else patent it?

The question

I'd like to make sure my understanding of how the US's first to file system and its grace period work together is correct. If I publicly disclose my invention on the internet, through a YouTube video for example, I now have a 1 year grace period in the US within which I can file for a patent. During that 1 year, a 3rd party cannot get a patent based off of my public disclosure. My public disclosure counts as prior art for the 3rd party. Is that correct?