Visitors to Wikipedia who see advertisements on the site have most likely fallen victim to a browser-based malware infection, Wikimedia Foundation, the organization operating the website, said on Monday.
"We never run ads on Wikipedia," said Philippe Beaudette, director of community advocacy for the Wikimedia Foundation, in a blog post. "If you're seeing advertisements for a for-profit industry ... or anything but our fundraiser, then your web browser has likely been infected with malware."
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Wikipedia Warns Users About Malware Injecting Ads Into Its Pages | PCWorld Business Center