ClaimsRodney Brooks

“Exponential growth of the number of users of a social platform such as Facebook or Twitter must turn into an S-curve eventually as there are only a finite number of humans alive to be new users, and so exponential growth can not continue forever.”

Rodney Brooks, writing on his blog 7 September 2017 [FoR&AI] The Seven Deadly Sins of Predicting the Future of AI (rodneybrooks.com) archived copy

Prediction Economics and markets

Exponential growth in the number of users of social platforms such as Facebook or Twitter will eventually turn into an S-curve because the number of potential users is finite.

Unresolvable The public record could not settle it.

Prediction: Statements about events outside the person's control, checked once they fell due: did they come true?

The second judge would not resolve this claim; the verdict shown is the first judge's.

What would count as true or false

Judged at the evaluation date, using the platforms named (Facebook and Twitter/X). True: reported user counts for both platforms show growth rates that have clearly fallen over time, with growth flattening, plateauing or reversing, i.e. an S-curve and not continued exponential growth. Mostly true: this is clear for one platform and the other's data are unavailable or ambiguous but do not show continued exponential growth. Mixed: one platform shows saturation and the other still shows sustained exponential (constant-percentage) growth. False: both platforms' user counts still grow at a constant or rising percentage rate with no sign of slowing.

Set before the research began.

Evidence (4)

  1. E1 Meta Reports Second Quarter 2026 Results Meta Platforms, Inc. (SEC Exhibit 99.1) · 29 July 2026

    “Family daily active people (DAP) – DAP was 3.60 billion on average for June 2026, an increase of 3% year-over-year.”
  2. E2 How Many People Use Twitter (X)? Sourced User Statistics GetXAPI (commercial X API vendor blog) · 9 October 2026

    “reports roughly 550 million monthly active users at March 31, 2026 and 520 million at December 31, 2025, counted across X and Grok together and deduplicated by sign-in”
  3. E3 How Many People Use Twitter (X)? Sourced User Statistics GetXAPI (commercial X API vendor blog) · 9 October 2026

    “After the first quarter of 2019 Twitter stopped reporting MAU and switched to a narrower daily metric (next section).”
  4. E4 How Many People Use Twitter (X)? Sourced User Statistics GetXAPI (commercial X API vendor blog) · 9 October 2026

    “Similarweb measured mobile daily users down 15.2% year on year in June 2025, and Threads passed X in daily mobile users in January 2026.”

Reasoning

Meta's evidence is a single 3% year-on-year growth figure (E1), which does not show a growth rate falling over time. X's data are a combined X and Grok figure that rose over one quarter (E2) and a mobile-only decline estimate (E4), so they are ambiguous. Neither platform clearly shows the S-curve that the criteria require for any verdict tier.

Cite this claim

Rodney Brooks, “Exponential growth in the number of users of social platforms such as Facebook or Twitter will eventually turn into an S-curve because the number of potential users is finite.” (said 7 September 2017). Verdict: unresolvable. Reliability API, claim c_738d041ba732, method 0.1.0+c876030c, dataset release v1.1.2. https://epistacklabs.com/claims/c_738d041ba732

This claim is in dataset release v1.1.2, with the same verdict.

Reply to this claim

For Rodney Brooks, or someone speaking for them: a correction or counter-evidence. Replies are read before anything is shown; an approved reply shows your name, role, date, statement and link. Your email address is never shown and is deleted 30 days after the decision (privacy).

More prediction claims by Rodney Brooks

  1. Resolved true Prediction 1 January 2025
    “Launch seems imminent.”

    Rodney Brooks wrote on 2025-01-01 that New Glenn's launch seemed imminent.

  2. Resolved true Prediction 1 January 2023
    “If electric sales continue to grow at 68% per year then 2025 would hit 28% of new cars in the US being electric.”

    If US electric vehicle sales keep growing at 68% per year, electric cars would be 28% of new US car sales in 2025.

  3. Mostly false Prediction 1 January 2026
    “Things at this stage are looking good for Artemis to fly in February 2026.”

    The Artemis II crewed lunar flyby looks on track to fly in February 2026.

  4. Resolved false Prediction 1 January 2024
    “Thereafter it is expected to fly with a crew once a year.”

    After its first crewed test flight in April 2024, Boeing's Starliner is expected to fly with a crew once a year.

  5. Mostly true Prediction 1 January 2023
    “I am concerned that Starship will not be ready for the proposed 2025 Lunar Landing of astronauts and that will really delay humankind’s return the to Moon.”

    Brooks said he was concerned that Starship would not be ready for the proposed 2025 crewed lunar landing, and that this would delay humankind's return to the Moon.

All of them

Verdicts are made automatically; how verdicts are made.