Shares of Redfin Corporation (NASDAQ: RDFN) were sliding today as the online real estate brokerage posted a solid second-quarter earnings report, but cast doubt on the housing market, saying it saw a significant slowdown in recent days. As a result, the stock was down 14.9% as of 11:23 a.m. EDT. Redfin revealed another round of strong growth in the quarter as revenue rose 36% to $142.6 million, well ahead of estimates at $137.5 million.