X on a roll: Nikita Bier's exit, xAI integration, ad recovery, and the everything-app push

In August 2026, Nikita BierDealroom has a profile for this one. Try Dealroom → announced he was stepping back from leading product for X (formerly Twitter), continuing in an advisory role. Bier described the move as "passing the torch" and returning to his "natural state: a poster," adding that serving the X community had been "the privilege of a lifetime." His departure comes at a moment when X's business — long written off after the turbulent Musk acquisition — is showing real signs of life.

2025 marked the first annual ad-revenue growth since Musk's 2022 takeover . Emarketer/Reuters reported X was set for roughly 17.5% US ad growth and about 16% globally. Bloomberg figures showed Q2 2025 revenue of approximately $707 million, up 20% year over year. The recovery is real but partial — ad revenue remains well below the roughly $4.4 billion X brought in during 2021–2022. Still, after years of advertiser exodus and brand-safety crises, growth is back.

In March 2025, Musk's xAI acquired X in an all-stock deal valuing xAI at $80 billion and X at $33 billion (or $45 billion including $12 billion in debt). The merger was designed to deepen integration of data, models, compute, distribution, and talent between the two companies. Grok — xAI's chatbot — had already been embedded in X; the acquisition made the relationship official and gave xAI direct access to X's real-time data firehose for model training. It also gave X a AI-native growth engine that no competitor can easily replicate.

X's product cadence under Bier's tenure was notably strong:

• XChat (April 2026): a standalone group messaging app for iOS, built primarily by one developer, extending X's reach into territory dominated by iMessage and WhatsApp.
• X Money (July 2026): a payments platform with digital wallet, peer-to-peer payments, and Visa debit card — Musk's long-promised "everything app" play. Premium Plus users get up to 6% APY.
• Ad platform rebuild (April 2026): 16 engineers replaced 1M lines of Scala with 50k lines of Rust and Python, achieving a 600x CPU reduction (from 6M cores to 10k). X Business called it "the most ambitious advertising platform rebuild in its 20-year history."
• Community Notes : X's crowdsourced fact-checking system — run by a remarkably lean team — has become the industry standard. Meta adopted a similar approach in 2025. Published notes cut re-sharing of misleading posts by 50–60%, and there is no company override button.

Bier's exit raises the obvious question: does the product momentum continue without him? He was brought in as a respected outside builder (TBH, Gas) and shipped tangible results — XChat, the Community Notes product evolution, feed improvements. X says he remains as an advisor, but the day-to-day product leadership gap is real. The xAI integration may partially fill it: Grok-powered features across the timeline and ads are now core to the product roadmap, and that road is led from xAI's side, not X's.

X and LinkedIn sit at opposite ends of the same spectrum. LinkedIn has a fortress moat and a mediocre product; X has a weak moat (no comparable identity graph, no monopoly on professional data) but has been shipping aggressively and improving the actual product. LinkedIn grows because it cannot be replaced. X grows because it is trying harder. The question for X is whether product momentum and the xAI integration can compound into something durable — or whether the next advertiser controversy, leadership departure, or platform shift resets the clock again.

For now, the trajectory is upward. That alone is notable.

Read more: Reuters · Reuters (ad revenue) · Bloomberg · The Verge (X Money) · Nikita Bier on X