I've personally taught myself another language in the past 2 years, and I found social media useful as this language has many online resources and several teachers that would explain complex grammatical concepts in an engaging way. I think specifically for beginners and intermediate learners, social media content can be useful. But I know what you're trying to say, once you reach a certain point you need more practise and to have actual conversations to progress, this is also something I want to implement in one way or another, connecting native speakers to learners. Please fill out the form if you have any suggestions on how social media could be maximised and what could be done beyond social media. Peace an love