It’s called a link post. Have you ever had just link(s) that you wanted to share? Probably.
Sharing links can be an easy way to pass around useful information to your community.
Here’s a useful post from Paul Chaney in his blog Conversational Media Marketing about how to do it. In it, notice the link to Amy Gahran, one of the blogging pioneers, where she writes about seven different formats for blog posts. Click it. It’s worth the read.