Economic observatory / digital systems

Digital Platform Systems

Explore separate histories of search referrals, browser use, mobile operating systems, social referrals, and AI assistant use. Different denominators prevent a combined ecosystem market-share score.

System field2026

01Search engines7,359HHIGoogle Search85.2%02Browsers3,612HHIChrome50.0%03Mobile operating systems5,337HHIiOS63.1%04Social referrals4,995HHIFacebook68.9%05AI assistants4,804HHIChatGPT67.1%

Evidence systems: 5
HHI anchors: 17
Share rows: 146
Attributed operators: 20
Measurement sources: 5

Public web-analytics screensExact same-month anchorsDefinition-aware HHIOfficial product attributionNo combined platform-power measure

Bounded platform evidence

Social referrals

1 system / 4 HHI anchors / 48 exact share rows

Evidence system

Systems: 1
HHI anchors: 4
Share rows: 48
Operators: 7
Sources: 1

Research surface

U.S. social-media referral traffic

Observed concentration histories

A common HHI scale, never a common market.

Blank cells are gaps. Every value opens through its own definition and source.

Evidence systemSame-month anchors where available

2023April

2024April

2025April

2026April

3,393first anchor

2,838-555 HHI

3,804+966 HHI

4,995+1,191 HHI

Social referrals

Social-platform concentration based on U.S. page views referred from social-media sites to StatCounter-tracked websites in April 2023-April 2026. The series measures outbound referral traffic, not platform users, time spent, advertising revenue, engagement, or an antitrust market.

Latest HHI: 4,995
Anchors: 4
Categories: 12

Common 0-10,000 HHI axis / separate evidence contract

Facebook202668.94%+16.99 pp Twitter / X202611.63%-7.84 pp Pinterest20267.53%-3.93 pp Instagram20266.28%-7.1 pp Reddit20262.35%+1.39 pp YouTube20262.33%+0.47 pp LinkedIn20260.40%-0.09 pp

5 smaller source categories remain in the exact ledger.

Measurement source custody

1 public measurement source

Operator-attribution sources stay in the matrix and exported packet; they are not substituted for measurement sources.

No ecosystem score.These five screens do not define one digital-platform market. Each keeps its own product boundary, page-view or referral denominator, participant categories, month, and permitted use. HHI values are never added, averaged, ranked into an ecosystem score, or treated as evidence of conduct.