Instapaper gives you a Read Later bookmark.When you find something you want to read, but you don't have time, click Read Later. Come back when you have time, or read your articles on the go.
"When you signup for an account with Summify, you have the option of adding your Twitter, Facebook and Google Reader accounts to receive a e-mail digest of the top five stories that have been shared in your social network. The e-mail also gives you information on network sharing, comments and engagement."