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I founded Defensio a few years ago and we fight exactly that problem. The amount of malware and spam we're seeing on high profile business and celebrity pages is astonishing.
> Security firm BitDefender said it had detected infections contained in the news feeds of around 20% of Facebook users

I've seen a lot of malware posts, but 1 in 5 users? I'm skeptical based on my biased sample.

> BitDefender arrived at its figures by analysing data from 14,000 Facebook users that had installed a security app, called safego, it makes for the social network site.

Well there you have it, their sample is clearly more biased. A large number of people don't install apps at all. Some people install apps indiscriminately... including both malware and "safego".

We monitor many public pages (not necessarily pages of people using Defensio) and I can confirm that their numbers are in the ballpark of what we're seeing as well.