From Facebook:
Chomsky is still lost somewhere in the Mission District. The last time he was spotted around [2 hours] ago was on 20th street heading towards Folsom street around Dolores. If you have anyone in the neighborhood that can help keep their eyes peeled for the little fella, I would greatly appreciate it. If they spot him, please have them call the SF Animal Control Animal Emergency (415) 554-9400. Thank you.
UPDATE: Found! In Daly City wtf! (Thanks, Megan!)