Several social networking sites - including Facebook and MySpace - have apparently been sending users' data to advertising agencies - in spite of all the assurances and promises that this information is not shared with anyone without having previously asked the users for consent and receiving a thumbs-up.

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In its bi-annual report the Web Application Security Consortium (WASC) has reported that attacks on Web 2.0 sites have increased significantly compared to last year.

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There has a been a steady increase in attacks targeting social networking sites such as Twitter and Facebook during the first half of 2009, according to a new report by the Web Hacking Incidents Database (WHID).

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Virus researchers have spotted a new variant of a Mac trojan that attempts to change a victim computer's DNS settings.

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More than 40,000 Web sites have been hit by a mass-compromise attack dubbed Nine Ball that injects malware into pages and redirects victims to a site that will then try to download Trojans and keylogger code, Websense said today.

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100,000 websites were destroyed by a targeted a zero-day vulnerability in a widely-used virtualization application.

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