A monitoring component installed in a network navigation interface, such as an Internet browser, is disclosed. The monitoring component monitors activity of a user performed via the network navigation interface among one or more network resources, such as e-commerce sites, blogs, media hosting sites, and social networking sites. The monitoring component further enables the user to selected at least one monitored activity to be shared with contacts known to the user. An activity service is provided that notifies the contacts of the selected activity and generates recommendations for the user based on the activities reported by the monitoring component. In this manner, users may share activities of interest with their contacts, as well obtain recommendations about items of possible interest.