The difference in traction is insane! Slack has 15,000 companies paying them in a few weeks after launch. In the article it says they have $1m/mo revenue - that

The difference in traction is insane! Slack has 15,000 companies paying them in a few weeks after launch. In the article it says they have $1m/mo revenue - that's incredible for such a young company. Investors are making a bet that this is indicative that slack are going to take over the entire enterprise communication space.