Social Media Bot

Hi, I would like a bot that can write private messages to account Instagram, Twitter, Discord and Facebook accounts. what does it mean, the bot will not have to write to random people but to a niche of people who might be interested in my product, so I would like a bot to write to certain people who follow a certain Instagram page/ Twitter page/ Channel Discord / Facebock Group. I would like you to make me a quote equivalent to bots for social