[ge0rg]

your FB friends are supposedly people you know in real life and trust

According to the article, this feature is also enabled for group chats, where you converse with people who are not even your FB friends.

people working on messenger

I happen to be working on a mobile messenger [0], and I can see the benefit of transmitting user location. Still, I would never implement it as an on-by-default feature on all outgoing messages. Sending a location should always be an explicit action performed by the user, for battery preservation reasons as much as because of the privacy.

[0] https://yaxim.org/