In 1990, no one had a personal phone or the Internet. We got all our jokes and memes from comic pages in the newspaper and various magazines. We literally shared memes and news by clipping them and snail mailing them to people.
In the mid-late 1990s, we got the Internet, and that gave rise to websites and chat programs, but there were plenty of people who didn't have a personal computer and used the ones at work/school.
The early 2000s saw everyone with a home computer. Armed with your digital camera, you could take photos of events, go home, load them on your computer, and share them with anyone you wanted. Or post them online to your website or blog or your favorite web forum.
It was the birth of the smartphone that transformed things greatly. No more home PC for many. Their phone is their computer. No more websites, use an app. Social media exploded once they became apps. Discord is the new web forum. All the messengers collapsed to be replaced with texting, iMessage, and apps like Whatsapp.
In 20 years, you probably won't have to email/text/Slack a link to someone anymore. You can just add it to their feed on some wearable device everyone will be wearing and make walking around with a smartphone sound as archaic as walking around with a discman sounds to us now.