That chart is amazing (and depressing, as another commenter said). I counted and I've used 18 different ones. I've also used a few others for video and audio conferencing, like WebEx (unless that falls under a particular Cisco one in the chart, I don't know).

Currently I'm "only" using Slack, Skype, iMessage, and Google+ Hangouts (very occasionally, with considerable loathing).

It strikes me the situation is inherently ridiculous, but after not far off 20 years of dealing with it, I can't say it bothers me that much anymore.