Instagram users are flocking to greener pastures after the photo-sharing service posted new Terms of Service this week. With the new TOS, users are required to consent to allowing the Facebook-owned service license their public photos to companies, organizations and advertisers. As CNET puts it, this could make Instagram a stock photo service in itself, without paying out to photographers.

More than likely, however, the new TOS are for Instagram users would be used in promotional images, rather than as stock photos that cheat the photographers out of money. It's the fact that the latter is a possibility that is causing some users to embark on an exodus to Flickr, Hipstamatic or Twitter.

The Verge reports that searching for Instagram on Twitter brings up several instructions for how to export your Instagram pics and cancel your account. There are also several tweets spreading about which photo-sharing services make a good Instagram replacement, such as the article Fast Company posted. 

The change in its Terms of Services coincides not only with the unwelcome change in photo-cropping functionality, but also as Twitter adds its own photo filters, and Flickr releases version 2.0 of its iOS client. It may be a temporary setback for Instagram, or it could spell the beginning of the end if the service doesn't do something fast to appease its users.