How much to fake a trend on Twitter? In one country, about £150

A BBC investigation has found companies offering to make hashtags trend artificially. Twitter says it's trying hard to clamp down on automated accounts - or "bots".

Reporters: Jonathan Griffin and Fahima Abdulrahman

Video journalist: Alex Dackevych

What do you think? Email BBC Trending or visit our Facebook page.

More details about our investigation on the BBC Trending blog.

All our stories are at bbc.com/trending.

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