Cryptic tech billboards in San Francisco have a cultural impact : NPR

"The billboards here are actually something that makes me feel really pessimistic about the city," said Allie, a San Francisco resident who was among the dozen or so people to comment on current billboard trends on NPR member station KQED's Forum talk show last summer. (Forum typically doesn't give the full names of callers.) "They kind of give this feeling that like the rumors are true and tech has overrun the city, and that's the whole culture here now."