I listened to an article about this on Woman's Hour on R4 earlier.
The thing that always seems to be missing from the debate is the fact that most social media is based in the USA where the constitutional right to free speech is used to justify comments that are socially unacceptable in the UK, and the owners of these apps and sites couldn't care less about UK laws or common practises.
Nothing will change unless our government intervenes with legislation, and even then it may not.
I gave up using Facebook as amongst other things, they carried advertising that didn't comply with UK law.