iReader is a great way to read RSS updates on your Mac. What I love about this is that you can sync it with Google Reader, therefore you can get all your blogger/GFC subscriptions as well as other websites! There's a management system so you can organise your subscriptions into folders, you can sync with iCloud, favourite articles, customise keyboard shortcuts for faster reading. Another fab thing is it supports offline reading and it's very easily laid out. If you follow blogs via RSS Feed, this App may be your new best friend.
The left had column shows what you are subscribed to, when you click on one, the posts update in the middle column, you can flick through or use the search bar and when you select one the post appears in the last column so you can read it. You can pin certain posts/articles and then select to only show those pinned. View all unread posts makes it easy to see what you missed and you can easily share posts you enjoyed from the services menu. Available to download from the App Store.