It's not just Zuckerberg - Slack CEO Stewart Butterfield is a big fan of universal basic income

Booming tech salaries and the resulting wage gap have put the greater San Francisco area at the center of conversations about income inequality in the United States. It's even become a central issue for a certain not-running-for-president billionaire, Facebook CEO Mark Zuckerberg.

In particular, Zuckerberg is an outspoken advocate for a universal basic income, which would guarantee all citizens a monthly stipend to cover basic expenses like food and rent. 

Advocates say the system is one of the surest ways to lift people from existing poverty, and it also happens to be a societal safeguard for when automation and AI take over more and more jobs. 

Turns out, Zuckerberg isn't the only CEO who thinks it's a good idea.

Slack CEO Stewart Butterfield took to Twitter on Friday to further a discussion on the role that family money has played in some of the most successful businesses. 

"Doesn't have to be much, but giving people even a very small safety net would unlock a huge amount of entrepreneurialism," Butterfield Tweeted.