I read it without signing in. The "Not now" link is greyed out and 4 points smaller and not a button. But it's there.
Honestly, how can someone into tech post something like this on FB?
Someone saw it and shared it to HN; enough read it to upvote it this much.. maybe Facebook's more popular than I thought! (That sounds silly or sarcastic, but 'among HN users and similar' I'm serious.)