Asaph is a micro-blogging system, focusing on collecting links and images from other pages. It allows you to post content directly from any page you are on. Asaph is not a full blown blog and it does not aim to be one — it just does this one task, but it's pretty good at it.
The alternative Stickney Theme also shows date and author information for each post and allows posting of longer texts. Feel free to modify these themes to your liking, or create new ones.