If someone is going to be reading your writing, it's best to switch to a serif font. Writing and posting to social media sharpens your skills because you get free audience feedback. It's FREE. It's good linguistic exercise and it heightens your perception of ordinary – and extraordinary– events. Social networks are a good testing ground for what resonates, and what doesn't. Let the English language be your playground. Use as few words as possible to tell your story. It helps to pretend each word costs money and you, my dear, are on a budget. Can you afford that sentence?
Also, a thesaurus helps.