Historical clue formulations

• YouTube journal posting — 2021-07-01
• Certain YouTube posting — 2020-05-18
• YouTube journal — 2016-08-24
• Certain YouTube posting — 2013-06-29
• Many a YouTube upload — 2013-01-29
• Journal on YouTube, maybe — 2011-12-12
• Journal on YouTube, maybe — 2011-11-16