Apparently you are unable to read.
you're the one with the comprehension problem. Twitter and facebook are businesses.
People were kicked off twitter and facebook because they violated the contract they had with those companies.
They signed and agreed to the TOS rules of those websites then repeatedly violated those rules.
They signed a contract with those companies agreeing that if they violated those TOS rules that company can kick them off the site.
What contract did those gay people sign with the florist and how did those gay people violate that contract?
You are the person with the comprehension problem.