Just a week after its acquisition of Welsh message board provider Jelsoft, Internet Brands, the Los Angeles-based operator of websites such as CarsDirect and BBOnline, has bought real estate social net ApartmentRatings. The purchase of ApartmentRatings is designed to buttress the online services of Internet Brands’ home buyers and sellers site RealEstateABC.com and mortgage lending information provider Loan.com. Launched in 2000, ApartmentRatings features more than 500,000 reviews and ratings of about 60,000 apartments across the country. The site also contains rent trend data and detailed maps. Renters can also connect with others and get advice from the site’s apartment living blog. Terms of the deal were not disclosed. Release