That other HN thread is from 35 days ago, when this submission's blog post was written, and the very second line of content in the HN comments is "We had opensourced our server[1] yesterday, which is perhaps why we are on the front page. Stoked to be here". ??
What I want is to be able to tag and describe pictures I take from my phone, and have those sync with my wife's phone. I can't really find anything that does that.