Twitter has been actively focusing on its advertising methods and features.
These choices will be signaled globally to our partners and will not affect browsing data.
The replies you sent to the followers are visible to them as normal.
However, in 2013, Twitter announced that it was going to become a publicly traded company, meaning they sold part of the company in shares to the public.
It makes your account private so that not everyone can see what you tweet and you can choose who can follow you.
But, that is not the case.