Whistlebox, an advertising technology firm that helps companies run user-generated video hubs on their sites, has raised $2.3 million in its first round of funding, per peHUB. paidContent has confirmed with co-founder and CTO Chas Martin that King Street Capital led the investment; the Brooklyn, N.Y.-based startup will use the funding for tech development and sales. Site owners can set up contests and create video ads with Whistlebox’s application; it currently powers SugarTube, the online video portal for Vermont-based ski resort Sugarbush. Whistlebox was founded in 2006.