Historical clue formulations

• Like many gift cards, nowadays — 2024-04-20
• Sent a digital message — 2024-03-25
• Like many invitations nowadays — 2023-05-04
• Corresponded with, in a way — 2022-06-23
• Contacted without a trip to the post office, say — 2018-07-11
• Worked on some screenwriting? — 2018-01-14
• Like many PDFs — 2013-06-07
• Sent with a click — 2012-06-05
• Like spam — 2007-02-09
• Sent free of charge — 2006-09-01
• Sent with a click — 2004-06-04
• Sent, in a way — 2003-07-04
• Sent on an impulse? — 2001-07-28
• Like modern messages — 1999-02-07
• Sent with a click — 1998-03-21