The U.K.’s four largest fixed-line ISPs have implemented...

The U.K.’s four largest fixed-line ISPs have implemented measures allowing users to block Web-based content at a network level, said an Ofcom report released Tuesday (http://bit.ly/UlH1RC). The move came after the four ISPs -- BT, Sky, TalkTalk and Virgin Media -- made an agreement with the British government to provide such filtering services, said Ofcom, an independent regulator and competition authority for the U.K. communications industries.