Kiki Schirr, writing about Slack for Tech Cocktail:

But there are also myriad secret Slacks. Like the now-passé secret groups of Facebook, these are kept relatively quiet; many members don’t even appreciate acknowledgement they exist, let alone mention of being a member. One of my secret groups is for movers and shakers in the startup world, another I’m prohibited from talking about entirely.

The chat is making a comeback, at least with techies. Personally, I think I’ll keep using Slack for work-related things primarily.