Write short and understandable messages. The eye only scans the messages for a few seconds, it must be quickly attracted
Tell a simple story, feel free to use a very "narrative" style, put a character forward and use the time present in these stories instead
Add emotions to your contributions (humour, sadness, allusion, tribute, etc.), what you feel becomes more and more important
Use more adjectives, adverbs and superlatives. The "spoken" style likes words that add dynamics to the text
Preferably use the imperative and action verbs (give your opinion, join us, etc.)
Restructure and reinvent classic sentences, even if it means moving away from formal grammatical rules (change the order of words, play with punctuation, use metaphors, neologism and other tricks)
Propose a catchy question, the question mark often encourages action and reaction