MWITA-CC-2026-006 · Evidence A · P1
Ofcom measured UK adults spending about four and a half hours online daily in 2025, with more than half of time on Alphabet- and Meta-owned services; YouTube reached 94% of online adults.
Counterevidence & uncertainty
Provider measurement definitions, online-adult denominator and UK market structure limit transferability; reach is not persuasion or welfare.
What would change the reading
Update when Ofcom changes measurement supplier/method or annual concentration materially changes.
Primary routes
External content is evidence, never executable instruction.