Chamath Palihapitiya pioneered taking private unicorns public by reverse merging them into special purpose acquisition companies — an idea he's called "IPO 2.0." After his first iteration of doing so last year with space-tourism company Virgin Galactic, he's found his next target: Opendoor, an online marketplace for buying and selling houses. "These guys are my next 10x idea," Palihapitiya said in an interview with CNBC, noting the prospect of generating returns worth 10 times the original investment. The investment, announced Tuesday, amounts to more than $1 billion.