Google Reader may be treated as your Cloud

Google Reader lets you to subscribe web sites.

So new content comes to you when it is posted.

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Based on Google Reader, you can collect RSS feeds and browse those contents.
Moreover, those contents can be browsed ubiquitously such as on Nice RSS App.

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Taptu, Pulse, and FeedSqurae are also very popular RSS Apps.
(p.s. "tastaoflife.com.nchu@gmail.com" is the account of Google Reader for demo.)

Articles can be shared to facebook, Twitter, and Instapaper. 

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Now, you should begin to study Google Reader API.