Former Twitter recruiter Morgan Missen is joining Foursquare today as Head of Talent for Foursquare West. Missen (née Missentzis) was the first Technical Recruiter at Twitter responsible for all backend engineering hires. Prior to that position she was Technical Recruiter at Google for three years. Missen's Foursquare hire is important because it solidifies the check-in service's ongoing San Francisco expansion; Foursquare is also closing in on an office in SOMA, and is planning on leasing space for between 30-50 additional engineers.