There has been some interesting commentary recently about social media and official languages. I say interesting because I am hoping that people don't move away from what social media is - a conversation between two or more people.
When you boil it down, it really is all about people having a dialogue and sharing information. Think about how you interact and converse with people in your daily activities. When someone asks you a question, you don't respond in multiple languages - of course not. You answer the person in the language that the question was asked, even if you do speak more than one language.
Social media should not complicate conversations. It is actually just the opposite. As with any conversation, stop and listen. Only when you have listened can you really have a meaningful dialogue.