According to Sean Parker the ex-President of Facebook, the site was created to exploit vulnerabilities in the human psyche. The design was to keep you on the site longer and in essence crave it.
“And that means that 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,” Parker told Axios. “And that’s going to get you to contribute more content, and that’s going to get you … more likes and comments.”
In the brain, dopamine functions as a neurotransmitter—a chemical released by neurons (nerve cells) to send signals to other nerve cells. The brain includes several distinct dopamine pathways, one of which plays a major role in reward-motivated behavior.
Parker added: “It’s a social-validation feedback loop … exactly the kind of thing that a hacker like myself would come up with, because you’re exploiting a vulnerability in human psychology.”
All of these people — understood this consciously,” Parker said. “And we did it anyway.”
So if you find this and other sites addictive, then you are correct there were designed to be so. SO we have to question the ethics of those who created this. The why is obviously the money and power.