(CNN) -- Faced with a loud and angry backlash from some of its most active users, photo-sharing app Instagram backtracked Tuesday on new language that appeared to give the company ownership of their images.

"The language we proposed ... raised question about whether your photos can be part of an advertisement," Instagram co-founder Kevin Systrom wrote in a blog post. "We do not have plans for anything like this and because of that we're going to remove the language that raised the question."

An update Monday to Instagram's terms of service had stated that data collected through the app can be shared with Facebook. That's not a surprising move, considering Facebook paid an estimated $1 billion for the photo-sharing service earlier this year.

But the language that upset some of the app's more than 100 million users said that "a business or other entity may pay" Instagram for the use of user images and may do so "without any compensation to you."

That didn't sit well with some -- including Facebook CEO Mark Zuckerberg's wedding photographer.

"Pro or not if a company wants to use your photos for advertising they need to TELL you and PAY you," Noah Kalina wrote Tuesday on Twitter.

Kalina stopped short of vowing to quit Instagram, saying he hopes that language will be deleted. The proposed changes are set to go into effect January 16.

Others weren't being so patient.

A popular Twitter feed associated with the hacker collective Anonymous was urging its more than 780,000 followers to dump the app Tuesday morning.

"Only way to opt out of @instagram selling your photos is deleting your account," wrote the person who runs the account. "Sounds good to us. #BoycottInstagram".

The feed posted image after image of screen shots from followers who had done just that. It claimed it was receiving thousands of such images -- too many to count.

Systrom wrote that the intent of the new terms was "to communicate that we'd like to experiment with innovative advertising that feels appropriate on Instagram."

"Instead it was interpreted by many that we were going to sell your photos to others without any compensation," he wrote. "This is not true and it is our mistake that this language is confusing. To be clear: it is not our intention to sell your photos. We are working on updated language in the terms to make sure this is clear."

The new terms appeared to significantly broaden what Instagram can do with users' content. Currently they say, "Instagram may place such advertising and promotions on the Instagram Services or on, about, or in conjunction with your Content."