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Mosseri says Meta is always focused on competition, but TikTok represented the greatest he’s seen during his time at the company. After seeing engagement plateau in 2019, however, the company has since bounced back thanks to building out Reels and better AI-powered recommendations. “We’ve seen a lot of growth for the overall app, though the percentage of the app spent on friend content has gone down,” Mosseri testifies.

Mosseri testifies that “growth is everything” to Instagram and the company was deeply concerned to see feed impressions declining and engagement on stories plateauing in 2019. “Competition from TikTok is a big concern,” a presentation from the time says, adding a “conservative estimate” that 40 percent of the decline in time spent on Instagram was due to TikTok, and 23 percent in the US in particular.

Mosseri says he used to think of those platforms as more “lean-back experiences,” but that’s changed in recent years. TikTok is now “every bit as participatory as we are at this point” and as YouTube has leaned into Shorts, it’s “brought them closer to us.” Mosseri notes that TikTok now has a friends tab, which a TikTok executive testified earlier in trial only accounts for about 1 percent of the videos viewed on the app.

In a January Reel, Mosseri announced a new feed within Instagram of videos their friends have liked in an effort to make sure Instagram is not just “a lean-back experience, but a participatory one, a social one.” It underscores how Instagram still sees connecting friends as a core experience on its app. Mosseri testifies he was distracted watching the video because “I’m mostly focusing on the one comment that said ‘definitely not a good idea.’”

In this 2024 video played in court, Mosseri explains that Instagram doesn’t plan to go after the long-form video market because it’s not as conducive to sharing and interacting with friends. Mosseri testifies that even today, “I still think friends are an important part of the experience.”

In an email thread from 2018, Mosseri checked in with Zuckerberg from paternity leave to try to communicate concerns the Instagram co-founders Kevin Systrom and Mike Krieger had with strategy changes for the app. Mosseri wrote that after catching up with Systrom, it was “hard for me to get a read on what’s going on as the relationship is strained.” He told Zuckerberg, “The core tension seems to be twofold: (1) you believe slowing down Instagram will help more than some others do, and (2) your tolerance for handicapping Instagram is expectedly higher than the Instagram team’s.”

Zuckerberg told Mosseri in a 2018 email that even as Instagram grows to include more public entertainment posts, it “can never exclusively be for public figures or it will cease to be a social product.” Meta has been arguing that the social media market has changed so much that entertainment is a key focus of social apps including Instagram and TikTok, but the email suggests that at least at the time, Meta’s CEO felt that connecting with friends would always need to be remain a core use case.

The Verge’s Editor-in-Chief Nilay Patel gets a shoutout in court when the government plays a clip of Mosseri’s January 2021 podcast interview. In the clip, Mosseri talks about joining Instagram and making changes to the safety and integrity operations. Mosseri says on the stand that he indeed “vaguely remember[s] talking to Nilay.” Here’s part of the transcript from the clip they played in court:

But the team decided to make it a standalone app because they wanted to replicate how within Twitter, replies are as prominent as the original posts — something that’s not typically the case on Instagram. The group decided it would be too confusing to users to squeeze in this different model. “That was a very contentious decision internally,” Mosseri testifies.

That’s how Meta viewed the app when it was evaluating launching a competitor that would eventually be called Threads. The FTC is trying to use Meta’s internal evaluations of Twitter to show that it doesn’t see the primary reason for going to Twitter as connecting with friends and family — and therefore, it’s arguing, in a different market from the one it says Facebook and Instagram monopolize.

Mosseri says the app finds the most success in blending entertainment with interacting with friends. That could look like commenting on a public post about a sporting event and interacting with a friend in the comments, he says. That’s important since Meta noted in documents around 2018 that people were sharing less in their feeds, and public content was increasing. The FTC is trying to point out that even if posting to the apps has declined, there’s still friends and family interaction happening.