I've been thinking that one of the most important issues in the modern internet is trust: is this e-mail really from who the sender claims to be? Was this text written by a human? If it was, is it propaganda? SEO filler? Written by a troll farm? Is this product what it claims to be? Is this review true?
I think the #fediverse is doing a much better job than other mediums on this front, largely thanks to tight moderation ensuring all my interactions here are with actual people.