FOMO and network effect. Just keep in touch with your friends as we did before facebook took over your social interactions and you'll know what they're up to.

FOMO and network effect. Just keep in touch with your friends as we did before facebook took over your social interactions and you'll know what they're up to. Anyways even if this friend posts about visiting on facebook, this is not guaranteed you will be shown this post, as demonstrated by the actual HN submission you're commenting about.