It's mind-boggling how these 23 Silicon Valley power players all used to work at Yahoo

Slack

Slack CEO Stewart Butterfield joined Yahoo when his last startup, Flickr, was acquired.

Founded in 1994, Yahoo is the oldest web company still in business.

So it's not surprising that it feels like almost everyone you meet in Silicon Valley spent some time at Yahoo.

That includes these 23 power players who continue to be a big part of the tech industry.

Some of them were early Yahoo members that led its massive growth. Some were brought in later in an attempt to revitalize its slowing business.

The large number of Yahoo alumni now leading innovative Silicon Valley companies reflect Yahoo's legacy in the internet industry and its long, turbulent history.