Slack has nearly 2 million users and a valuation of over $3 billion. Launched last year, the service is a new messaging platform that would minimize the need for email. Slack CEO and co-founder Stewart Butterfield joins “CBS This Morning” to discuss what sets the communication service apart. Source

NBC has released an ad promoting presidential hopeful Donald Trump’s upcoming appearance on “Saturday Night Live,” but the network is also facing protests. Mashable business and media reporter Jason Abbruzzese discussed controversy with CBSN. Source

A woman is facing charges for impersonating a nurse at the hospice facility where Whitney Houston’s daughter spent her final days. Police say the suspect has been caught for this same crime before. “48 Hours” Crimesider’s Graham Kates joins CBSN with details on the investigation. Source

In every episode of the CBS police drama, “Blue Bloods,” the family sits down and reconnects over dinner. Those gatherings inspired “The Blue Bloods Cookbook.” Bridget Moynahan, who plays an assistant district attorney on the show and co-authored the book, joins “CBS This Morning” to discuss her latest project. Source

The singer-songwriter performs a classic track from his 1977 debut album, “My Aim Is True.” Source

The portrait of former house speaker Dennis Hastert was taken down from the speaker’s lobby following Hastert’s guilty plea last week to hiding cash withdrawals he used to make hush money payments. Source

The U.S. military paid $43M for a single gas station in Afghanistan that should have cost a fraction of that price. CBSN’s Contessa Brewer has more on the sticker shock. Source

Teen blogger Essena O’Neil was paid by various companies for product placement in her Instagram posts because she had so many followers. She now says she’s giving up social media entirely. CBSN’s Contessa Brewer has the latest. Source

GOP presidential candidate Ben Carson leads the polls, while former frontrunner Donald Trump turns his attacks to Marco Rubio. Newsweek politics correspondent Emily Cadei joins CBSN to discuss. Source

CBS will stream a new Star Trek series in 2017, becoming the first traditional television network to debut a stream-only show. CNET senior editor Jeff Bakalar joins CBSN to talk sci-fi. Source