Citation

Giving Pledge - Footnote 13

confirmed100% confidence

1 evidence check

Last checked: 4/3/2026

Migrated from citation_quotes. Original verdict: accurate

Evidence — 1 source, 1 check

confirmed100%Haiku 4.5 · 4/3/2026

Found: - **2010**: Launch with 40 U.S. signatories representing about 14% of U.S. billionaires at the time

Note: Migrated from citation_quotes accuracy check. Original verdict: accurate

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