Skippy Peanut Butter, the first spreadable peanut butter started in Alameda, CA.  The former plant has been torn down, and the site now has a Wallgreens and a Starbucks.  It's located at 1916 Webster St. 

Here are some articles on the history:

http://www.litwriting.com/pdf/skippy.pdf

http://acooksca.com/2011/01/21/peanut...