Slack Valuation Jumps From $1B To $2B In 5 Months

Slack Technologies Inc. is quickly rising up the billionaire startup chain. The online workplace collaboration tool is reportedly raising $160 million at $2.76 billion valuation in its latest funding round. This report, from the Wall Street Journal, continues to support a Bloomberg estimate that Slack has reached an over $2 billion valuation. In October 2014, the…