Meta Threads — The Fastest App Ever to 100 Million Users

On 5 July 2023, Meta launched Threads, an Instagram-linked text-based social network, in 100 countries. 10 million users in seven hours, 70 million in two days, 100 million in five days—obliterating ChatGPT's two-month record and setting, at the time, the fastest growth of any consumer product in history.

Why It Was the Fastest — Sitting on Top of Instagram

The dominant reason for Threads' exponential start was simple: Meta brought an existing social graph along wholesale. Sign-up was tied to an Instagram account; username, profile photo, and follow graph migrated with a single tap. Instagram had two billion monthly active users. If even five percent of them wanted a text social product, you reach 100 million in days.

The launch was also a deliberate raid on Twitter, then in the middle of the Musk-era chaos and freshly under "rate-limit exceeded" rules (a 600-tweet daily cap imposed on 1 July). On launch day Mark Zuckerberg posted that the goal was "a public conversations app with 1 billion+ people". The amplified spectacle of a Musk-vs-Zuckerberg "cage match" did not hurt traffic.

A Seven-Month EU Delay — The DMA Barrier

Threads at launch was unavailable across the 28 EU member states. The reason, acknowledged by Meta, was uncertainty about the Digital Markets Act (DMA, passed in 2022, applicable from March 2024). The cross-service data integration between Instagram and Threads—core to the product's design—risked falling foul of the DMA's prohibition on gatekeepers combining personal data across services without explicit consent.

EU access finally arrived on 14 December 2023, initially as a read-only mode without Instagram-linked sign-up; full functionality was unlocked in stages thereafter. The episode made visible, again, the way European regulation (GDPR, DMA, the DSA) routinely delays or reshapes US-built consumer products.

The Initial Crash — From 100 Million to Daily Actives

Behind the "fastest to 100 million" headline, daily active users fell roughly 70% by August (Sensor Tower). Most of the new sign-ups were one-time visits—"let me see what the Twitter-alternative is like"—and did not stick. The product was rough: weak search, no hashtags, no direct messages, an algorithm-driven feed with no straight chronological Following view. Twitter power users complained loudly.

Meta responded across late 2023 and 2024 with rapid additions: better search, topic tags, a chronological Following tab, trending topics, a fuller web client, polls.

ActivityPub — Big Capital Plugs into the Decentralised Protocol

In March 2024, Threads began test integration with ActivityPub, the open protocol that powers Mastodon and the wider Fediverse, available initially in the US, UK and Japan. Opt-in global rollout (excluding the EU) followed in December 2024. In June 2025, Meta added a Fediverse feed allowing Threads users to search, follow, and read posts from Mastodon, WriteFreely, Bookwyrm, Flipboard, and other ActivityPub-speaking services from inside the app.

With roughly 350 million MAU, Threads became the largest app on ActivityPub—an outcome simultaneously dreamed-of and feared by the decentralised-social camp. The entire Mastodon network had registered users in the low millions; one Threads is two orders of magnitude larger. Some voices warned of an "embrace, extend, extinguish" pattern; others stressed that, finally, an open social protocol was operating at mainstream scale.

2025 — Past 400 Million MAU

In Q3 2025 Meta reported Threads had crossed 400 million monthly active users. The trajectory through the year: 320 million in early 2025, 350 million by mid-year, 400+ million by year-end. Compared with X (estimated MAU around 600 million but with advertising revenue roughly halved), Threads was reaching parity in user scale while monetising more gradually.

Ads launched formally on Threads in 2025, sharing the Instagram ad system—meaning that within two years of launch Threads was reachable by Meta's existing advertiser base of millions of buyers.

What It Showed

Threads demonstrated two things.

First, an existing platform's social graph is a weapon. What used to take years—zero to 100 million users—can be done in days if the new product can import its neighbour's graph with one button. That capability is unique to companies with multiple consumer services (Meta with Facebook/Instagram/WhatsApp, Google with Gmail/YouTube) and raises real competition-policy questions.

Second, the geographic asymmetry of regulation. The same product launched in the US on 5 July and in the EU on 14 December. DMA, GDPR, and the DSA were doing visible work on product design and launch timing. The cliché that "regulation slows innovation" understates the actual phenomenon: regulation produces geographic differentiation of digital products, and that became, in the late 2020s, the baseline state of the social-platform world.

The partial migration of attention from X to Threads also left a recognisable pattern: the form invented by Jack Dorsey in 2006—microblogging—lived on, but its vessel split three ways. One person's private asset (X), a giant platform company's strategic product (Threads), and the decentralised protocols (Mastodon, Bluesky) now share the field.