Feed Rinse is an easy to use tool that lets you automatically filter out syndicated content that you aren't interested in. It's like a spam filter for your RSS subscriptions.
There are several reasons why you probably do not want to share too many aspects of your life with Google: It has a near monopoly in several aspects of the Internet, and has its hands in many others: search, advertisement, calendaring, cloud storage, social media, news, e-mail, maps, online office …
This site lists competition. And by using several of these, you give Google the chance to gain new insights about you by combining data from several services.