Facebook is making a bigger push into the world of Internet security with the launch of a new Antivirus Marketplace this morning — teaming with Microsoft, McAfee, Trend Micro, Sophos and Symantec to offer Facebook users six-month licenses to security software to better protect them from online threats.

The social network says its URL blacklist — which aims to stop its users from accessing malicious sites from Facebook — will also now incorporate the databases of those companies.

Facebook says less than 4 percent of the content shared on its site is spam, and it’s hoping to reduce that number in the future.

The push is all the more important considering Facebook’s size. The company said in a regulatory filing this week that its users now number more than 900 million people.

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