Friend: posts a one-line thing
Me: composes a long response
Friend: keeps posting a whole thoughtful thread on the thing
Me: posts my response to the original thing

Sometimes social media accidentally recapitulates that meatspace thing where I wait for my turn to talk instead of listening. Propogation lag contributes; usenet felt like that a lot, too. Wait, go back, & check the whole thread is a good habit (& easier here than on usenet!)