The gig: Nirav Tolia, 45, is the co-founder and chief executive of Nextdoor, the neighborhood social network that lets people connect with their neighbors, share news, tips and sometimes gossip with their local community. The San Francisco-based 152-employee startup has raised $210 million in venture capital funding and boasts more than 126,000 communities using its platform, covering more than 70 percent of U.S. neighborhoods.