Robin Good: Keemix is a web publishing service which allows anyone to create their own web magazine by easily capturing and editing content already available on the web.
You can create multiple channels/topics covering different topics/interests, share items on social networks and have a personalized Keemix web site with your custom look.
From the official site: "Keemix allows you to gather loved content from the web, mix it into your own custom-designed pages, and share it to inspire your friends and colleagues.
Mixes can be private or public, and administrated individually or collaboratively.
Keemix is tightly integrated with all major social networks and broadcasts your content through feeds or newsletters, helping you reaching like-minded individuals."
A bookmarklet makes it easy to grab any site, article, video, image or text you may run into on the web.
By invitation only. (I don't have one yet)
More info and samples: http://keemix.com/
(Thanks to Giuseppe Mauriello for discovering this)