The extensive antitrust lawsuits that are opposing Facebook Inc. laid down a fresh bipartisan marker for enforcement after years of uncertainty, however a closer look will be taken by the federal court system that has proved uncertain of extensive antitrust intervention.The Federal Trade Commission and 46 states filed lawsuits, as the social-media giant allegedly preserved a social-networking monopoly throughout long-years of campaign by freezing out potential competitors and investing in nascent competitors such as Instagram and WhatsApp.The cases come as a national debate over whether a bunch of tech corporations have become too dominant-and whether antitrust enforcers should have pushed more towards powerful police firms and concentrated industries. Criticism of the FTC and Justice Department, which share antitrust authority, has come from Democrats and Republicans alike.