Slack’s $120M raise was big news this week. Learn why selective wipe on mobile devices is not enough on its own. Of course, Tim Cook, CEO of arguably the most admired company in the world, delivered a significant message.

I. Tim Cook Speaks Up

In an essay in Business Week Apple CEO, Tim Cook, @tim_cook, wrote, “I’m proud to be gay, and I consider being gay among the greatest gifts God has given me.” Cook decided that the potential good of his message on human rights and equality out-weighed his own valued privacy. Beautifully written.

II. Selective wipe: The secret to getting users to report lost mobile devices

Employees are often reticent to report a lost or stolen mobile devices to employers for fear of losing personal data if the device is wiped. It is important that IT use a mobility solution which allows selective wipe of data. Selective wipe means, for instance, that only business content on a smartphone or tablet may be wiped, not personal content. The next challenge is that employees need to be informed as to what the company procedure will be when a device is reported lost. In this piece in InfoWorld, Ryan Fass, @ryanfaas, makes the case that transparency and communication when a device is lost need to be part of the company’s mobility policy.

III. Stewart Butterfield explains why Slack is now worth more than $1 billion

What is Slack? One of the fastest growing enterprise software companies in history. The Slack platform was released to the public in February 2014. It is used by 30,000 teams to send over 200 million monthly messages. Slack raised $43M in April and just raised an additional $120M at a $1.12 billion post-money valuation. Writing in Fortune, Dan Primack, @danprimack, interviews founder and CEO, Stewart Butterfield, about Slack, the competition (HipChat and Yammer), and selling his first company, Flickr, to Yahoo.

IV. Following iPhone 6 and 6 Plus Launches, App Marketing Costs Hit an All-Time High

The launches of the new iPhone 6 phones sent an influx of new users to the App Store for mobile apps. Sarah Perez, @sarahintampa, explains in TechCrunch that advertising costs to win them over are up. In addition, the upgrade to iOS 8 caused users to have a free up a lot of storage space on their devices, which lead to users deleting many apps.

–Maureen – I tweet at @mobilehelix