Out of the box Sitefinity allows you to list all the blogggers that post in the blogs module of your Sitefinity website. If you want to add a blog roll for external blogs you have to create your own widget (can be user control) that will display your blog roll.
the Telerik team
Do you want to have your say in the Sitefinity development roadmap? Do you want to know when a feature you requested is added or when a bug fixed? Explore the Telerik Public Issue Tracking
system and vote to affect the priority of the items