Many ActivityPub servers have a feature to follow a hashtag locally -- subscribing to receive all the content with a particular hashtag that your server knows about, as it arrives. Could we provide a similar feature across the Fediverse? tags.pub is a project to implement that feature -- collecting tagged content and redistributing it by hashtag. In this talk, Evan will discuss the motivations behind tags.pub, its implementation, and outline future steps for global hashtag services.