There are sites that track this information or you can use the way back machine. IRC is a quarter or less of what it used to be in say 2005-2010.

That is real data.

That too, the number of users is way down.

Well no they are not. Netsplit follows IRC and tracks users and IRC servers. You can watch the decline over time. Quakenet alone had nearly 200,000 monthly active user alone back in 2005.

The split of freenode, the technical abilities of people, and the lack of a easy to use mobile client all made people turn away from IRC. Factor in discord and Reddit and you lose even more.

The number of servers from 2005 to today has dropped also. From 3500 to about a thousand.

I love IRC, but it has been on a decline for a long time. Particularly if you factor in the number of online users today versus back then in general. The percentage of them that uses IRC or even knows what it is, is much smaller.

I suppose you could argue that unpublished networks, onion sites, and other IRC outside of mainstream exist, but how many users do they have?

Go look at the major irc chat hosts. Add up daily users. Then compare that number to the estimated users in 2005-10.

Lemmy isn’t social. It’s just forums aggregated. One could use it as a social app, and some people do, but it really is not necessary or even really welcomed.

I have seen estimates of a reduction of 50 to 75 percent in the number of forums over the last 15 years. There are certainly a lot less. People go to reddit or discord these days.

Same with IRC but the decline is even higher.

I would not consider Lemmy social media. Forums are few and far between, IRC is barely still kicking and Usenet (as it was) simply doesn’t exist.

I was curious about Usenet awhile ago, was it still linked computers mirroring information like the old days? No, it more or less simply linked usenet providers at this point.