 Tag Team is a bookmarking tool that lets you curate and share links in a new and powerful way. In Tag Team, users can create and manage tagging projects to aggregate resources from across the internet working in groups or independently. While tagging online resources, we create informal tag vocabularies known as folksonomies. As we develop these tag vocabularies through the act of social tagging, Tag Team has the power to move a folksonomy into a controlled tag vocabulary, giving users control over the tags that they've created. Let's say you're tagging online resources related to hedgehogs in art history for a research project and you've used the tag Hedgehog for 400 items in a Tag Team Hub. Using a filter, you can change all instances of the tag Hedgehog to the plural Hedgehogs retroactively in moving forward without the need to make this change for each item. If you want to find and share what you've tagged, Tag Team Hubs are searchable and every tag creates a feed so you can share what you've tagged online in multiple formats. In Tag Team, you can tag alone or as part of a group, giving users the opportunity to add new collaborators to a Tag Team Hub. Tag Team at Harvard is made for collaborating on academic projects, but Tag Team's code is open source, so if you like what you see, you can host your own instance of Tag Team. Tag Team is supported by the Laura and John Arnold Foundation as part of the Harvard Open Access Project at the Berkman Klein Center for Internet Society at Harvard University. We look forward to hearing about how you use Tag Team to tag online resources and manage the tags that you create.