Long ago I stopped putting my bookmarks on Explorer, Chrome, etc. as I didn't not want to be married to one laptop. Think about it. Your school laptop is re-imaged probably once a year and each time you have your bookmarks deleted. There is a way you can suck in your Chrome, Mozilla or Explorer So Diigo is a great way to save your bookmarks on the cloud. You can set up your own account or login using Google, Twitter, Facebook or Yahoo.
Below this is a video explaining how to sign up and above is one showing how you can use groups in a class. If you use it with your students they do not have to have a Diigo account nor even share their email (although that allow them to be updated with alerts).