Pretty sure WhatsApp makes more money than Slack. It made $15m in first 6 months of 2014. In theory it's on track to make 100s of millions of $ per year with th

Pretty sure WhatsApp makes more money than Slack. It made $15m in first 6 months of 2014. In theory it's on track to make 100s of millions of $ per year with the $1/year fee. Slack might make $1-2m/month with the 200k paying customers.