I have some gorgeous bookmarks but I seldom use them as they are more like souvenirs than practical items. I tend to use a slip of paper or a post-it note. Sometimes I use the little page tags like in the image above. I use those when I'm researching and want to mark several pages!

I read a lot on my tablet too so just use the bookmark facility in Kindle.

I never fold page corners down. Hell I don't even crack the spine if I can help it.

I’ll use post it’s too especially if I’m reading during lunch at work and forgot my bookmark. lol