At Admin Panel -> Settings -> Switches, there's a "member blog RSS" switch. When this is turned on, an extra field appears on the edit profile page asking members if they have a personal blog with an RSS feed they'd like to use. If they supply a valid feed url, WSN will regularly check their blog for updates and display the linked title of their lastest blog entry amongst the member info on the left side of their posts. It also shows up on their view profile page. This can encourage people to post more to raise awareness of their blog, and can foster a sense of community as members get to know each other better via their blogs.