Instagram announced today that it's cracking down on the use of third-party apps to boost growth. The company said that apps that generate fake likes, follows and comments violate its policies and going forward, those who use these sorts of apps will be prompted to stop. "We're taking a number of steps to limit this kind of unwelcome behavior," Instagram said. "Accounts we identify using these services will receive an in-app message alerting them that we have removed the inauthentic likes, follows and comments given by their account to others." They'll also be asked to change their passwords.