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Tens of thousands of people have joined a Facebook group calling for a public inquiry to look into the holding of the G20 summit in Toronto.

As of this afternoon (July 2), Canadians Demanding a Public Inquiry into Toronto G20, started by a Toronto-based law firm, boasted more than 37,000 members.

The group’s wall is filled with links to stories and videos about the heavy-handed tactics that police employed during the G20 protests. Its events tab lists a few upcoming rallies that aim to keep the issue in the spotlight.

Of course, all it takes for someone join a Facebook group is clicking a button on the social-networking site.

Another way Facebook users, as well as people on Twitter, can show their support for a G20 inquiry is by adding a Twibbon to their avatar.

Only 38 supporters had adopted the #G20 Public Inquiry Twibbon, however, as of this afternoon.

The Twibbon overlays an upside-down Maple Leaf on your profile image.

For those who want an inquiry but aren’t satisfied with monkeying around with their social-networking profiles, Amnesty International has created an on-line form that makes it easy to send a message to Prime Minister Stephen Harper.

The Canadian Civil Liberties Association also has a petition calling for a G20 inquiry. Getting on that list involves sending the organization an e-mail.

The best way to stay in the loop on all things G20 is to keep an eye on the #G20 hashtag on Twitter.

You can follow Stephen Hui on Twitter at twitter.com/stephenhui.