T he Fourth International Public Knowledge Project Scholarly Publishing Conference was held August 19 – 21, 2013 in Mexico City, Mexico. I have shared an archive of the tweets tagged with #pkpconf on figshare. I started the archive on Augutst 14 2013 at 15:02:58 GMT and the I closed the last tweet in the archive is from  01 September 2013 at 20:16:39 GMT. The archive contains 841 tweets.