On Aug. 1, four top members of the House Committee on Energy and Commerce sent letters ordering 33 cable and Internet companies, including Google, Microsoft, Comcast and Cox Communications, to provide details about their privacy standards, the New York Times reports. That followed House and Senate hearings last month about privacy and behavioral targeting, in which advertisers show ads to consumers based on their travels around the Web. As advertisers become more sophisticated about behavioral targeting, and online privacy standards become increasingly varied, regulators and privacy advocates are becoming concerned. A few companies have taken precautionary measures to try to fend off criticism; in the last few days, for instance, both Yahoo and Google have made it easier for people to opt out of targeted ads on their sites. But that may not be enough.