Usenet is still around and still fairly active, though by volume its probably more commonly used as the originating source for anything torrented nowadays. PHP

Usenet is still around and still fairly active, though by volume its probably more commonly used as the originating source for anything torrented nowadays. PHP bulletin boards is a good approximation if you squint. If you imagine being on a large number of topical mailing lists all filtered into their own inboxes you wouldn't be far off.