A browser obtains content items from a content server, where the content items may include web pages, any individual content within a web page, items fetched via a web services-based API of the content server, and/or items in a feed. Additionally, an interaction module of the browser obtains information about interactions with the content items by those with some relationship to a user of the browser, such as the user's friends on a social networking site. Based on the obtained information, the browser provides an illustration of the information in visual association with the content item. For example, the browser may directly highlight or otherwise visually emphasize the content item itself, or it may provide an indicator for the browser or web page as a whole, or it may display some or all of the information.