From Soft Spots: Five Places Where Silicon Valley’s Bubble Could Pop:

Protesters blockade a Google bus near the corner of 24th and Valencia in San Francisco. Source: Chris Martin/Flickr
Protesters blockade a Google bus near the corner of 24th and Valencia in San Francisco. Source: Chris Martin/Flickr

Flickr photo by Chris Martin, used under a Creative Commons license. https://www.flickr.com/photos/cjmartin/11295788563/