Butterfield’s last startup, Flickr, also started as a facet mission but ended up changing photograph-sharing forever. Employers cannot learn private-channel Slack messages and DMs — except they subscribe to a pricing tier meant for shoppers in fields like finance, who are required to take care of full communication data. Slack Frontiers is a enterprise conference and never appropriate for anyone under the age of 18. Guest passes or partner tickets usually are not out there. The financing round values the startup at $5.1 billion, up from $3.eight billion the final time The Vision Fund is joined by Accel and other investors, Slack said Sunday. Be part of the #slackroulette neighborhood and…