South Park ‘Dot-com’ was the word on the street here in the mid-’90s, when venture capitalists plotted website launches in parkside cafes with tattooed 20-something techies. But speculation is nothing new to South Park, which was planned by a real-estate speculator in the 1850s as a bucolic gated community. Though the South Park development itself never quite took off, a plaque on an office building around the corner at 601 3rd St marks the birthplace of Jack London , esteemed author of The Call of the Wild, White Fang and many other popular adventure stories. Otherwise the neighborhood retreated into obscurity, and Filipino American war veterans formed a quiet community here until the dot-com boom. Nowadays it seems even the birds in the trees are twittering about another South Park venture, founded here after the dot-com bust: Twitter.