Slack just added Square CFO Sarah Friar as the company's first independent board member. So, is the company readying an IPO?
"No," Butterfield told Axios. "I've said publicly before that we are trying to run the company so that we're ready to go public, not because we are going to necessarily."
Rather, Butterfield characterizes the addition as "part of growing up." an effort that will also see the company invest this year to translate the service into more languages and be more useful to the largest of businesses.
For more on Butterfield's plans for Slack, (and why he won't be buying back Flickr) read on. Click here for his thoughts on Donald Trump (and he has many).