It feels good when big companies too take care of the environment. Facebook has added a new building to its California headquarters designed by Frank Gehry. The building is environment-friendly coming with a recycling water system. Sheryl Sandberg, Fb’s COO on her Instagram account posted photos of MPK 21 and said the building will save nearly 17mn gallons of water a year. The office is spread over the area of 523,000 sq. ft.