>it was only posted on Facebook

Not sure how email solves that problem.

Email will notify you of events that are only publicized on Facebook? :thinking_face:

I mean, to be fair, even Facebook won't necessarily tell you about an event unless the event creator pays them money to promote it. It's actually not a great platform for small-scale publicity, and _only_ publicizing an event on Facebook is clearly a mistake for a number of reasons. But despite its many virtues, email doesn't actually address GP's case at all.

A contact list would, like what likely existed for every previous reunion in GPs high school since before 2010. My schools periodically reach out to update your contact info for their alumni roster. I bet GP never gave the school their contact info after graduation rather than this being a facebook only situation (unless it was just organized by a handful of alums and not tied with the school itself).

There isn't a passive tool that would solve this other than getting people's email or mailing address, and that's absolutely fine since if you wanted to go to these reunions and be invested in these events, you can send an email to the school and get yourself on this contact list.

That relies on a number of speculations, most importantly that GP was incorrect about the event having only been published on Facebook. I've seen enough small organizations work that way that I wouldn't be so hasty to second-guess GP's description.

Email wouldn't allow you to effortlessly aggregate the email addresses of everyone, and then to communicate the message out. There's a really large overhead there that doesn't really exist with Facebook.