LONDON (CBS SF/AP) — Facebook expressed anger at the United Kingdom’s competition watchdog Wednesday after it ordered the social media site to sell off GIPHY because it said the acquisition of the company stifles competition for animated images.

The social network’s strongly worded response to the Competition and Markets Authority (CMA) sets the stage for a battle over the future of GIPHY.

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In the Wednesday letter, Facebook said the watchdog’s decision contained “fundamental errors.” The American company questioned whether the authority’s call to sell GIPHY after acquiring it last year would be effective or enforceable.

“The CMA’s complete divestiture remedy is grossly unreasonable and disproportionate,” Facebook said.

GIPHY’s library of short looping videos, or GIFs, are a popular tool for internet users sending messages or posting on social media.

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The watchdog opened an investigation into the acquisition shortly after Facebook announced the deal reportedly worth $400 million. It found that the acquisition would hurt competition for GIFs among social media platforms and in the digital advertising competition market.

Facebook said there are “serious questions” about whether the British regulator can enforce a global order for a company to sell off a business unit and whether it would be effective – issues it said the watchdog should consider “before taking the extreme intrusive step of ordering the sale of a company which does not carry on business in the U.K.”

The CMA is due to its final report on the deal on Oct. 6.

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