Hactivism: Hacktivism is the act of hacking, or breaking into a computer system, for a politically or socially motivated purpose. The individual who performs an act of hacktivism is said to be a hacktivist.
A hacktivist uses the same tools and techniques as a hacker, but does so in order to disrupt services and bring attention to a political or social cause. For example, one might leave a highly visible message on the home page of a Web site that gets a lot of traffic or which embodies a point-of-view that is being opposed. Or one might launch a denial-service-attack to disrupt traffic to a particular site.
Hacktivism involves many different levels of social intervention and engagement. Whether it is to do with direct action, self-referential geekiness, obscure networked antics, crtical gaming, or peer 2 peer and collective change. Hacktivists challenge defaults put in place by other people, usually the systems imposed upon them and the rest of us by authority. Even though the subjects themselves may be concerning serious matters, humour and playfulness are both essential ingredients.
Hackers: In computing, a hacker is any highly skilled computer expert capable of breaking into computer systems and networks using bugs and exploits. Depending on the field of computing it has slightly different meanings, and in some contexts has controversial moral and ethical connotations. In its original sense, the term refers to a person in any one of the communities and hacker subcultures
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1) Anonymous is a loosely associated international network of activist and hacktivist entities whose trademark is the Guy Fawkes mask. Some call them social justice awrriors that have attracted attention across the globe in 2011 after helping Arab Spring activists during blackout in Egpt with their SPeak2Tweet Campaign, attacking credit card companies after refusing to process payments to WikiLeaks.