The billionaire and former Facebook president Sean Parker now says he regrets helping turn the social network into a global phenomenon. The site grew by “exploiting a vulnerability in human psychology” with its greed for attention and the careful reward system it created to keep users addicted.

“We need to sort of give you a little dopamine hit every once in a while, because someone liked or commented on a photo or a post or whatever… It’s a social-validation feedback loop… a vulnerability in human psychology,” he admitted to news site Axios.

Parker’s backing was instrumental in turning the Harvard campus-only software into a global phenomenon by introducing Zuckerberg to Silicon Valley venture capital. (Parker [“A million dollars isn’t cool. You know what’s cool? A billion dollars”] was played by Justin Timberlake in The Social Network.)

Read the post on The Register