One of Twitter’s problems is that it’s tilted a little too far towards the vim end of the scale. It looks like a dead-simple service, but those humble 140 characters have been crammed full of features over the years, and the ways they interact aren’t always obvious. There are rules, and the rules generally make sense once you know them, but it’s also really easy to overlook them.
I’ve known about Twitter since around 2006, but I’ve only been using it — haphazardly at first — from maybe 2011. Even though I’m pretty good about figuring out unwritten rules (see: living in Japan), as a semi-newb to the service there are a lot of things about how it works that I really didn’t know. This is a fantastic resource.