Feedbin is an online RSS reader and content aggregation service that allows users to subscribe to and read RSS feeds from various sources in a single, centralized interface. It offers features such as customizable themes, keyboard shortcuts, and integrations with other services like Instapaper, Pocket, and Evernote. Feedbin also supports Twitter streaming, enabling users to follow Twitter feeds, and offers email newsletter subscriptions, allowing users to receive and read email newsletters within the same interface.