Gl.am lets you easily and quickly create groups of links which can then be identified by one shortened url address. You can also write a description about each link. Most importantly, it shows a screenshot of the link, which means photos can be shown, too.
It’s similar to other sites on The Best Ways To Shorten URL Addresses and The Best Social Bookmarking Applications For English Language Learners & Other Students lists, which is why I’m adding Gl.ad to both of them.
You can also read on the bookmarking list how I use these types of tools to promote higher-order thinking activities like categorization.