Over the past couple weeks, I have been seeing more and more webmasters complaining about their rich snippets disappearing from the Google search results page.
In short, webmasters who had rich snippets displaying, mostly for reviews rich snippets, no longer see their stars.
For example, Home Depot shows rich snippets here:
But a year ago, it looked like this:
So Home Depot didn't have, Walmart did, now they don't. And before that, Walmart did not and Amazon did:
Back in October 2013, Google performed a 15% reduction in rich snippets and it would not surprise me if they did this every now and then. Maybe a few weeks ago they reran their rich snippet reduction algorithm (or rich snippet quality algorithm or whatever they call it) and it resulted in many sites losing their rich snippets again?