I haven't taken any steps to protect my own work online, although I probably should. It's handy that UK copyright law automatically copyrights my things because it means I don't have to take steps to ensure that it's legally mine. My problem is that I have no current proof that the work is my own, like a watermark.
I've only just started developing an online presence with my art Instagram and I have a Vimeo page that nobody visits.
I always credit anybody else who's work appears on my Instagram page, like if I'm uploading a screenshot of my animation with someone else's background.
I will create a watermark to place over my work when presenting it on my website, which I'll develop in 3rd year.