In company filings published this week, it said 8.7% of its 955 million active users might not be real.

Duplicate profiles made up 4.8% of the users, user-misclassified accounts amounted to 2.4%, and 1.5% of users were described as "undesirable".

The estimate came at a time of growing concern about the value of marketing on the platform.

Full story: http://www.bbc.com/news/technology-19093078

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