Hell one of the downvoted comments is just "IRC comes to mind"... Just hand waving away all of the problems that something like slack is trying to solve, which the article talks about.
Worst case, it turns out being a legit article, in which case it's cool. Eh, no big deal.
If someone is astroturfing, I suggest you stop immediately.
I'm downvoting them as I see them for this reason. Anyone saying "Why not IRC?" to the question of "Slack alternative?" is being willfully ignorant at this point.
Same goes to those who accuse people of astroturfing absent evidence other than "$ideaILike is being downvoted".
You can't impute motives why someone might ask that question. You may feel it has been repeated ad nauseum but it's quite possible those asking the question haven't read the previous HN comments.
At this point, you come over as an arrogant jerk.
To avoid repeating myself: http://lists.lca2016.linux.org.au/pipermail/chat/2016-Januar...
As soon as you say "run a bouncer" you limit your audience severely. Without a bouncer, you're a transient in the world of IRC. Doubly so if you have the temerity to want to interact from a mobile device that pops on and off networks all the time.
[1]: https://events.ccc.de/congress/2015/wiki/Congress_Everywhere and yes, they use IRC. LCA's audience is a bit different