As the weather turned chilly, I thought about putting out the word on Twitter about my annual turtleneck vision quest. But that seemed both inefficient and potentially annoying to those followers (the vast majority no doubt) who didn’t care to hear my concerns about cuff length and fabric heft. What I needed was a way to reliably crowdsource my shopping with a community of people who were, in essence, agreeing to accompany me on a shopping trip and expecting me to return the favor. That’s when I joined the Prowl, a social networking site founded last August by the creators of the popular parent-networking sites CafeMom and its spinoffs, Mamás Latinas and the Stir. (via The Prowl: A shopping social network and new rival to Pinterest.)