Venture capital firm Greylock Partners, which passed on the chance to invest in Pinterest four years ago, is hoping to hit a bullseye by tapping the online bulletin board for its first female investing partner. Greylock said Thursday it has hired Sarah Tavel, Pinterest’s founding product manager. Venture in particular has come under fire, in part due to a high-profile discrimination lawsuit brought by former Kleiner Perkins partner Ellen Pao against that firm.