Mattermark, the business intelligence site that pivoted out of YC-backed curation site Referly, is today announcing that it has raised a round of $6.5 million, funding that the startup will use the funding to build out its ambition to be a “B2B Google.” By that, it means creating structured data for people on the hunt or company information across the messy and disorganised Internet. Or, as new investor Brad Feld of the Foundry Group puts it, uncovering a “valuable secret hidden in plain sight.”