Las Vegas Review Journal – Caesars Entertainment Corp.’s interactive subsidiary has acquired an Israel-based social gaming business, the company’s fourth deal in the past few years to expand its presence in the growing free-to-play gaming market. Caesars did not disclose financial terms to acquire Pacific Interactive, which owns the slot machine-style, free-play application House of Fun. Social gaming has become a growing business for several gaming companies, including Caesars, which owns the World Series of Poker and Playtika, and International Game Technology, operators of DoubleDown Casino. The activity is free to play on Internet platforms, including Facebook, but customers often…