If you don't use SlideShare, I suggest you look into it. You can upload your own slide shows to it as well as find slide shows there to "favorite" and download. Some of the ones you download, you can edit to use for teaching in your own classroom. Others, once saved to your "favorites" and tagged into categories, can be later accessed for showing in your classroom. SlideShare has many benefits. You don't even need an account to browse around to see what is there. But once you discover the advantages of SlideShare, you are likely to open an account.
Slide shows found on SlideShare can be downloaded and embedded into blogs and websites, as illustrated below.