It would only do that if you limit your feed selection to your 'bubble', something you should not do. Add feeds which oppose your view to get a more balanced diet. This greatly expands the 'bubble' to the point of it no longer being discernible. Of course you can only read a limited number of articles in a given time frame but you'll have a much larger body of articles to choose from than those who rely on a single source.

To the parent poster, what is your solution to escaping the 'bubble'? I do hope you're not relying on any profiling search engines (Google, Bing, etc) or ditto news aggregator (or, ${deity} forbid, Facebook) for that purpose as these actually reinforce the bubble perspective by expressly showing you material deemed to coincide with your viewpoints.