Twitter tempts us with a delicious possibility: that we might find connection with total strangers. On Twitter, we can discover people who share our moral vision—or, at least, our weird tastes in memes. Sometimes it works, and Twitter gives us warm and intimate communities. But Twitter also hands us the perfect weapon to exploit that intimacy: the retweet. Most of us on Twitter spend our time in some small backwater. We chat with a regular gang, in a space of shared context. We use insider language; we throw around ironies without explanation. Sometimes, Twitter can just seem like a long…