Who Is Adam Mosseri.

Adam Mosseri is the head of Instagram, and for a brand team he is something more useful than an executive name: he is the person who explains, under his own byline, how the app decides what people see.

He has run Instagram since 1 October 2018, after a decade inside Facebook that included leading News Feed. Meta’s own biography says he “oversees all functions of the app, including engineering, product and operations.”

What makes him worth following is not the title. It is that he explains Instagram’s ranking in public more regularly and more directly than most people who run a platform, in blog posts, interviews and live Q&As. Most brand teams read the trade press summaries of those explanations, or nothing at all, and then wonder why their reading of their own skip rate and share rate keeps disagreeing with the advice they were given.

From designer to News Feed

Mosseri did not come up through engineering or ad sales. He started as a designer.

According to Meta’s biography, he set up a design consultancy in 2003 with offices in New York and San Francisco, working on graphic, interaction and exhibition design. He then became the first designer at TokBox before joining Facebook. He studied at NYU’s Gallatin School, concentrating on information design and media.

Instagram’s own announcement of his appointment says he joined the Facebook design team in 2008. Meta’s biography says he served as Design Director for Mobile Apps, then moved into product management, where “he led the News Feed product and engineering teams for many years.”

That last line is the one that matters for social teams. News Feed is where Facebook’s ranking became the thing publishers and brands built their distribution around. The person now explaining Instagram’s ranking spent years running one of the most consequential feeds there has ever been.

Taking over from Instagram’s founders

On 1 October 2018, Instagram’s co-founders, Kevin Systrom and Mike Krieger, announced on Instagram’s blog that Mosseri, then Instagram’s Vice President of Product, “will become the Head of Instagram starting today.”

Their post describes his path in one sentence: he “moved from design into product management, and spent time working on Mobile then News Feed and most recently, we recruited him to Instagram.” It also says he would “oversee all functions of the business” and recruit a new executive team, including heads of engineering, product and operations.

The founders framed the handover around community, calling him a product leader with “a deep understanding of the importance of community.” This October marks eight years in the role.

What the job covers

The scope is the whole app. Meta’s biography lists engineering, product and operations, and the 2018 announcement says all functions of the business.

For a brand, that means the person explaining ranking is also the person accountable for the product decisions that change it: what Feed shows, how Reels are recommended, what counts as original, what gets limited. When he explains a signal, he is describing a system he is responsible for, not commenting on someone else’s.

That is the reason to treat his words as a primary source rather than one opinion among many. It is also the reason to read them carefully, which we come to below.

Why he explains ranking in public

In June 2021, Mosseri published “Shedding More Light on How Instagram Works” on Instagram’s blog. It opens: “It’s hard to trust what you don’t understand. We want to do a better job of explaining how Instagram works.”

The post explains why the chronological feed ended. Instagram says that “By 2016, people were missing 70% of all their posts in Feed, including almost half of posts from their close connections.” Ranking was the answer to that problem, and the post closes with a commitment: “Our plan is to be proactive about explaining our work across all three areas from here on out.”

He updated it on 31 May 2023 as “Instagram Ranking Explained”, again under his own name, which says: “There are a lot of misconceptions out there, and we recognise that we can do more to help people, especially creators, understand what we do.”

Alongside the written explanations, he takes questions in person. In 2021 he ran a live Q&A during Instagram’s Creator Week, and in 2025 he sat down with the creator and podcaster Brock Johnson to answer common questions about growth and the algorithm.

What his ranking posts actually say

The single most important line in the 2023 post is the one most people get wrong: Instagram does not have one algorithm. It uses “a variety of algorithms, classifiers, and processes, each with its own purpose.” Feed, Stories, Explore and Reels each rank differently.

The post names the signals for each surface, with the Feed, Explore and Reels lists given roughly in order of importance and the Stories list unranked:

• Feed: your activity, information about the post, information about the person who posted, and your history of interacting with them.
• Stories: viewing history, engagement history and closeness to the account.
• Explore: information about the post, your activity in Explore, your history with the account and information about the account.
• Reels: your activity, your history with the account, information about the reel itself and information about the account.

For Feed, the post spells out the predictions it makes: “the five interactions we look at most closely are how likely you are to spend a few seconds on a post, comment on it, like it, share it, and tap on the profile photo.”

It also says Instagram aims to make some reels less visible, naming low-resolution or watermarked reels and reels that have already been posted on Instagram. That one sentence should change how a lot of brand teams handle their video.

The originality rules most teams missed

On 30 April 2024, Instagram’s creators site set out four ranking changes under the title “Helping Creators Find New Audiences.” Two of them matter most to brand accounts.

First, every piece of eligible content is shown to a small audience, with the stated aim of giving all creators an equal chance of breaking through, and the best performers then reach wider audiences. A small account can break through; a large one is no longer protected by its size.

Second, originality. The page says “It takes a lot of time and effort to create original content, so those who create it should get credit and distribution,” and that when identical content is found, “the original content will directly replace the copied version in recommendations.” Accounts that repost other people’s content 10 or more times in the last 30 days without enhancing it “in a material way” are not shown where Instagram recommends content.

For a brand that fills its grid with reposted creator clips and trend remakes, that is the whole reach problem in two sentences. Getting this right is a large part of how we run Facebook and Instagram for brands: the system behind the content decides whether the content is eligible to travel at all.

What he says about reach that teams do not want to hear

The 2021 post addresses shadowbanning directly, and its most useful sentence is an admission: “we can’t promise you that you’ll consistently reach the same amount of people when you post.”

In the 2025 podcast, as reported by Social Media Today, he said Instagram makes changes daily rather than in big overhauls, and that major shifts are “very rare.” Reach that swings, in his telling, more often reflects what is happening in the world, the season, or how people are using the app.

That is uncomfortable for a team that blames every bad week on an algorithm change. It moves the question back to the content and the process behind it, which is where most of the fixable problems live.

Where his explanations stop

Following Mosseri closely does not mean taking every word as a guarantee. Three limits are worth holding on to.

1. He names signals, not weights. The posts say what matters, and for most surfaces in what order, never how much. Any claim that a like is worth a specific number of shares is not coming from him.
2. He speaks for the platform. His explanations are accurate descriptions of intent, and they are also Instagram communicating its own priorities. Read them as the rules of the room, not as a neutral audit.
3. Interviews are not policy. A podcast answer is a useful signal of direction. The written posts on Instagram’s own blog and creators site are what to build process around.

Our piece on what Instagram counts as original content now shows the gap in practice: the principle is published, but how a classifier treats a specific edit has to be learned from your own results.

How NBK thinks about platform statements

We treat what the person running a platform says as operating input, not background reading. The difference between a team that grows and one that stalls is often whether anyone owns that input.

What good looks like is simple:

• One person owns platform statements. They read the primary post, not the summary, and log what changed.
• Every statement becomes a check. If Instagram says watermarked reels are made less visible, someone confirms no watermarked export leaves the building.
• Monthly review against your own data. Compare what Instagram says it rewards with what your account actually rewarded, and note where they differ.
• Old assumptions get retired. If a rule your team follows cannot be traced to a primary source, it goes on the list to test.

None of this needs more content. It needs a system that turns what Mosseri publishes into decisions your team actually makes.

Next step

If your team is posting regularly on Instagram but still feels stuck, the constraint is usually in the system rather than the ideas. NBK can help find it, starting with what Instagram has said in public about how it ranks and what your account is doing against it.