Armchair

Selon l'encyclopédie Wikipedia :
"An armchair is a chair with arm rests.
Armchair can also be used as a pejorative modifier to refer to a person who experiences something vicariously rather than first-hand, or to a casual critic who lacks practical experience, in phrases such as armchair revolutionary, armchair general, armchair quarterback, and so on."
Voir également la définition, les exemples et les traductions sur Answers.com
C'est dans le deuxième sens qu'est utilisé le terme dans l'exemple qui suit de "armchair activism"
Armchair Activism chains are based on the misguided belief that we can influence social, political, or economic policy from behind our PCs. They usually take the form of e-mail petitions that ask you to add your name and send them on or boycott chains that ask you to refrain from using someone's product or service.
Armchair Activism refers to efforts to influence socio-political change through the ineffective use of e-mail and Web sites, ignoring safer, more effective means of advocacy. Armchair Activism comes in two basic flavors: the e-petition and the boycott chain. Both are typically poorly designed, misguided and pitifully ineffective.
Ce site répertorie toutes les chaines de e-pétitions qu'il considère inutiles, inefficaces, et toutes sortes d'adjectifs négatifs dans le genre.