Seattle-based TeachStreet, an online site geared at helping people find classes and tutors, announced this morning that the firm has expanded its services into the San Francisco Bay Area. TeachStreet is venture backed by Madrona Ventures and Bezos Expeditions. The Bay Area expansion follows an expansion into Portland in August. The firm said it now has over 65,000 new classes, instructors, teachers, tutors, and coaches in its system.