Wikipedia Foundation, the organization operating the popular online encyclopedia, has issued a warning to its users, telling them that if they are seeing adverts while browsing WIKIPEDIA site, it is likely that their computers have become a victim of malware infection.

“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.”

Then how WIKIPEDIA is running?

WIKIPEDIA’s operating costs are covered by donations. Every year an online fundraiser is organized, and that’s usually the only time when a banner is displayed on the site’s pages.