The newly listed company defended itself by saying it was a means to prevent cyberbullying. It said when a user was blocked, there tended to be post-retaliation blocking.
Dan Ackerman, senior editor of CNET told Tech Yeah that while reversing its decision amounts to admitting to a mistake, Twitter users got a little too worked up over this policy.
In online retail news, Amazon may be taking a stab at brick-and-mortar warehouse clubs like Sam's Club and Costco by opening Amazon Pantry.
Amazon, which already has a "Subscribe and Save" option for food items sold on its site, plans to launch Pantry next year, focusing on its Amazon Prime members, according to unnamed sources cited by USA Today.
Amazon didn't immediately respond to requests for comment from CNBC.
—By CNBC's Christina Medici Scolaro.