ESTIMATEDDate confidence: ESTIMATEDA target, not a fixed dateHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all ESTIMATED pins73% CONFIDENCEOverall confidence: 73%How well the pin's source and references back up its dates.Weighted average of how firmly 2 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins from 50% to 74% confidence
Groundbreaking year: approximate calendar placement from the published year, month, or season; the selected day is a placeholder, not a verified event day. This is not an opening date.[1]Meta’s site-specific information sheet describes the DeKalb, Illinois data centre as part of its operating infrastructure. The global directory records a 2020 groundbreaking. This timeline milestone is not an opening date.
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