Cloud-based app 'Slack' reaches 4m daily users

The fastest growing business application Slack has reached over four million daily active users worldwide, it was reported today.
The cloud-based messaging app, popular among workplaces, has more than 1.25 million customers paying to use the service including high profile companies, such as LinkedIn, eBay, Conde Nast, and EA.
With a current annual revenue of $100m, the service allows users to communicate with others through dedicated channels, and customize usability through apps such as Trello,