The lack of threading is what really kills the usefulness of Slack. This is why we settled on Flowdock in our company. If you don't have threading, you lose th

The lack of threading is what really kills the usefulness of Slack. This is why we settled on Flowdock in our company. If you don't have threading, you lose the one best feature of those new chat solutions, the single advantage they have over decades-old IRC: conversations at least slightly detached from time. On Slack, you have to be there all the time in order not to miss things or to participate in just about any conversation. If you aren't, soon it will be too late and no one will know what you're replying to. As for other advantages, I noticed that one of the biggest uses is file exchange. If there was another simple way to just drag&drop a file somewhere and have people access it, those chat apps would see less use. But there isn't. I haven't seen the bad effects in our company. Perhaps they occur at larger company sizes.