Venture capital firms Originate Ventures and Osage Venture Partners reinvested alongside Kaplan Ventures after backing ProtonMedia's $2.5m series A round.

Kaplan Ventures, the corporate venturing unit of Washington Post education subsidiary Kaplan, has led the $4.5m series B round for US-based social network ProtonMedia.

Venture capital firms Originate Ventures and Osage Venture Partners reinvested after backing ProtonMedia’s $2.5m series A round.

ProtonMedia said it would use the money to integrate its ProtoSphere virtual collaboration environment in life sciences with ComplianceWire, Kaplan EduNeering’s online learning system, and launch a second-generation virtual collaboration environment that uses Microsoft’s Lync software. Lisa Clune, Kaplan…