On Wednesday afternoon, after remaining conspicuously silent since Friday night, Zuckerberg pledged to restrict third-party access to Facebook data in an effort to win back user trust.
He has pledged to restrict immigrants from any countries that join the EU in future.Such talk may please voters, but the ebb and flow of EU migrants seems likely to be driven more by economics than by politicians.
Then, Mr Romney promises to keep the tax cuts revenue-neutral by ending deductions, which he pledges to restrict to those earning $200,000 a year and up; this isn't mathematically possible, but if it were, it would mean the income-tax burden would shift even more heavily towards high earners, again perpetuating the line that the poor are freeloading.
Responding to Cameron's speech last week in which he pledged to restrict access to housing benefits and the NHS for those coming to the UK under EU free-movement rules, the European commissioner for employment, social affairs and inclusion, László Andor, told the Observer that his claims were misleading and very unfortunate.
Google pledged to restrict fake news sites from using its AdSense advertising network.
But Republicans in Congress and industry lobbyists defeated any moves toward restrictions, and last year Mr. Bush, in abandoning a campaign pledge to restrict carbon dioxide from power plants, said it "is not a pollutant under the Clean Air Act".
That would make Vote Leave's pledge to restrict EU immigration impossible to achieve without ditching the common travel area that currently allows the public to move freely between the two countries, he said.
After years of inveighing against "money in politics", they've tolerated his breach of the pledge to restrict himself to public financing as McCain has done (to his cost).
Green campaigners offered a cautious welcome to Rudd's pledge to restrict coal-fired power by 2023 and eradicate it in a decade, although they have been critical of government moves to abandon support for renewable energy.
