The CEOs from four of the largest tech companies are testifying in front of the House Judiciary subcommittee on antitrust Wednesday.

Facebook CEO Mark Zuckerberg on Wednesday said the social network competes fairly and lags behind its competitors in many areas.

?The most popular messaging service in the U.S. is iMessage. The fastest growing app is TikTok. The most popular app for video is YouTube. The fastest growing ads platform is Amazon. The largest ads platform is Google,? Zuckerberg said during his testimony before the House Antitrust Subcommittee.

Zuckerberg also argued that Facebook?s $19 billion acquisition of WhatsApp in 2014 allowed the company to compete against telecommunications companies.

?When Facebook bought WhatsApp, we could compete against telecos who used to charge 10 cents a text message but not anymore,? he said.

Zuckerberg also argued that Facebook competes against companies globally, especially the rising number of tech companies coming out of China.

?We compete hard. We compete fairly. We try to be the best,? he said. ?That?s what I was taught matters in this country.?

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