General Yelp, Google Maps, and Zillow apps not opening by default

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http://androidforums.com – So in the past if I clicked on Yelp, Google Maps, or Zillow links from google search results, they would appropriately launch the native apps so I could see what I was looking for within the app itself. Great, this is how it is supposed to work. However at some point a few months ago this stopped working -- and now when I click on Yelp, Google Maps, and Zillow links, they open up on their respect mobile websites within my browser -- not good. I didn't change anything on my end so I'm not sure why this happened. Any way to remedy this? Thanks, (General)