Anecdotally, I've never bothered to sign up for Twitter, and the experience for logged-out users has contributed to that. Instead of thinking "wow all my friend

Anecdotally, I've never bothered to sign up for Twitter, and the experience for logged-out users has contributed to that. Instead of thinking "wow all my friends and important people are on there so I guess I'll sign up," I think "well this isn't very engaging, but I still technically got the content I came for, so I'm not really incentivized to go further." And I disagree in general - login processes are often a huge barrier. People don't want to create accounts everywhere; it used to be cool and novel, now it's a burden.