Prudential Northwest Properties moves to new platform
Philadelphia-based brokerage's 4,000 agents will affiliate with Berkshire Hathaway HomeServices
Brokerages represent 20 percent of Prudential-affiliated agents
Real estate's biggest new brand has launched Facebook, Twitter and Instagram pages
HSF Affiliates will continue to operate 'multiple real estate brands'
Buffett provides insight on the new real estate brand
Company's 11 Prudential affiliates will rebrand as Berkshire Hathaway HomeServices this year
HSF Affiliates making brand available in late 2013
Leadership team staying in place at Fresno-based Guarantee Real Estate