Aggregage, an online publisher of business-to-business sites, has raised $1 million in a convertible note round.

The money will go toward launching new sites and grow its advertising sales. Andrew Goodenough, former president and chief executive of Summit Business Media, will join its board.

Aggregage’s audience-driven social media platform curates online content for different industries. The El Segundo company has launched more than 20 vertical specific sites, including Supply Chain Brief for logistics and 3D Print Pulse for 3-D printing.

“Trade media has been dominated by trade magazines, but, just like consumer publications, these B2B publications are failing readers and advertisers in every industry,” Aggregage Chief Executive Robert Flynn said in a statement.

Staff reporter Melissah Yang can be reached at [email protected]. Follow her on Twitter @MelissahYang for the latest in L.A. tech news.