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So far this year, Facebook has shut down 5.4 billion fake accounts on its main platform, but millions likely remain, the social networking giant said Wednesday. That's compared to roughly 3.3 billion fake accounts removed in all of 2018, CNN reports.

As much as 5% of its monthly user base of nearly 2.5 billion consists of fake accounts, the company said, despite advances in technology that have allowed Facebook to catch more fake accounts the moment they are created..

The number of fake accounts disabled by the company peaked earlier in the year, when Facebook said it shut down more than 2 billion in the period from January to March. It removed relatively fewer fake accounts over the next three months — 1.5 billion — which Facebook attributed to improvements in its blocking of new fakes. But the number is on the rise again: Facebook's latest report shows it eliminated 1.7 billion fake accounts from July to September.

The announcement came as part of Facebook's newest transparency report, which for the first time includes information about Instagram.

Between April and September, the Instagram data show, Facebook took down roughly 3 million pieces of content that violated its policies against selling drugs. The company acted against another 95,000 pieces of Instagram content related to gun sales.

The Instagram-focused data also cover the company's enforcement efforts against child exploitation; suicide and self-injury; and terrorist propaganda. But the reporting on Instagram does not cover topics Facebook includes for its main platform, such as bullying and hate speech.

During the call with reporters, an executive noted that Facebook's systems are being used extensively by Instagram to detect harmful content. As the company has faced calls from politicians and observers to be broken up, Facebook executives have repeatedly argued that its size and resources make it better equipped to fight misinformation and provide a safe environment for users.

Earlier this year, Facebook began allowing its hate speech algorithms to begin automatically removing content that it believes violates the company's policies, the report said. One result of that decision has been a sharp spike in the amount of hate speech taken off Facebook.