Content maintained in an online social network or other online communities is tracked for changes and updates. The content may include user profiles, digital photos, digital audio and video files, testimonials, and identification of users who are friends. When such change or update occurs, users of the online social network or online community are notified according to various criteria that they have set. The notification may be provided by e-mail, an RSS feed, or a web page when accessed. With this feature, users can browse through content of other users with efficiency.