Slack CEO addresses market concerns following Q2 earnings

Slack shares dropped following the release of its second-quarter earnings results. Although it beat on full-year guidance, revenue growth in the quarter, which ended on July 31, came in below 50% on an annualized basis, in line with the two previous quarters. That’s a disappointment compared with video-calling software company Zoom, which showed 355% growth during the coronavirus pandemic. Slack CEO Stewart Butterfield joins "Squawk Box" to discuss.