In the wake of the Affordable Care Act, healthcare software startups are relying on increased care demand to fuel their inventions, and are borrowing methods from social networking and consumer apps, such as Foursquare, the Wall Street Journal reports. The article points out that venture capitalists have invested $948 million in 144 health-tech companies in the first nine months of this year, 16 percent more than was invested in all of 2012. Such companies, according to WSJ, include startups that focus on medical records, such as Practice Fusion Inc.; online-therapist services like Breakthrough Behavioral Inc.; activity trackers like Fitbit Inc.; and Glow, a fertility app created by PayPal co-founder Max Levchin. Article