people need more than money, they need to feel like they are being heard. They need to feel valued. When you write random posts and no one sees it you feel bad. People go back to facebook because their friends and family are there and they are using social media to be SOCIAL, not make money. ALSO Facebook/twitter/instagram are all EXTREMELY easy to use, EXTREMELY addictive and they don't have to worry about different password keys and prices and all that nonsense. It is wrong to believe that money is the only or even main driving force behind people's decisions.