For me it said a lot. Because he doesn't stop at the title, it's not a tweet, he goes on to properly explain what he consider usefulness and how to achieve it.

For me it said a lot. Because he doesn't stop at the title, it's not a tweet, he goes on to properly explain what he consider usefulness and how to achieve it. And the idea that I should aim to being useful and not persuasive is pretty powerful to me. I do think is more ambitious to be useful in the way the described than just persuasive.