Sharing _exact_ locations by default without realizing it is creepy/intimidating. The content of the message/the incident itself is just an anecdote that explains how the GP noticed this idiotic behavior of FB's chat.
Commenting on the anecdote derails the thread as far as I'm concerned. The subject is 'FB shares detailed location data and you might not know it', not 'one time, in band camp, I lied to a friend about my ETA'.
Ignoring that, there's no way to judge his communication with a friend. The only two people that can decide whether a lie like that is acceptable are the people involved. The friend might be offended and agree with you. Or laugh about it and ask for a beer in return, being totally fine with it. Expecting it? Who knows. And still irrelevant.
We can blame HN for being unable to hide subthreads, but for now the first 2 pages on my 25" monitor discuss if lies are acceptable or not and in what circumstances..
