Professional social media service LinkedIn (NYSE: LNKD) recently acquired start up Careerify, according to Tech Crunch, a software that is similar to Linked In, yet on a smaller scale. According to Tech Crunch, Careerify offered three services: employer branding software, internal mobility software and employee referral software. From now on, the start up will only feature referral software. “We decided to join LinkedIn due to what we lacked – massive scale,” CEO Harpaul Sambhi said, according to Tech Crunch. “More than 30,000 companies across the globe leverage LinkedIn for recruitment, and with more than 347 million members, LinkedIn offers an opportunity to make a much larger impact on job seeking and hiring.”