Reddit is a nice alternative to Usenet but not really a replacement since it is ...

Reddit is a nice alternative to Usenet but not really a replacement since it is centralized as opposed to Usenet's distributed nature.

As for e-mail, if you have a decent provider spam is a solved problem. It hasn't bothered me for years.

Trust me, if it didn't cost extra as a part of ISP packages nowadays, I'd be on USENET.