I love learning new tech tools, and while I'd heard of PearlTrees before, I had never taken the time to work with it. It's a pretty slick tool!
Basically, PearlTrees is a social bookmarking tool, but the design of it makes it particularly conducive to creating a curated collection of resources about a given topic. This makes it ideal for educational settings in which you might want to provide students with a curated list of links, infographics, videos and the like to build background for a particular subject.
Here's an example PearlTree I created for my Introduction to Education Course. We spend a good bit of time in that course examining school reform initiatives, and this collection of resources will help them understand the history that brought us to the current point, some of the different reform initiatives currently being implemented, and the different perspectives in favor of or strongly opposed to these different reforms.
You do have to create an account to get started, but it's free and easy to do so. Once you do so, you can edit your profile, add a picture, give a few sentences to describe yourself, etc., or not, if you'd rather stay more anonymous.
You can create different categories for links and resources you want to keep track of and collate into curated lists. I installed the Chrome extension, which makes it drop-dead simple to add things to your collections and start new collections.
If you are the sort of teacher who might want to create and keep lists of links, videos, graphics, and the like for your students' use, PearlTrees might be just the solution you're looking for. I highly recommend it.