- The official subreddit for San Diego California, “America’s Finest City”. As California’s 2nd largest city, top 1% sub that’s over half a million strong!, serving the whole of San Diego reaching North & East counties. Plus topics concerning our sister city Tijuana MX. As a modern digital public town square, we’re here for sharing of information, opinion & events that impact us all together in the richness & diversity that makes us “America’s finest”. Please READ our rules before posting