Twitter announced Thursday that users can now share public tweets inside direct messages.If that announcement struck you as a headscratcher—couldn't you do that before?—you're not wrong. You've long been able to include links to a tweet's detail page in a private message on Twitter. But especially on mobile devices, that's been a cumbersome, multistep process.Twitter now makes it a feature that's easily available by pressing down on a tweet for a longer period, which could encourage more people to have private conversations about tweets.