Gary Marcus wrote a long Twitter thread on the morning of 2023-03-30 responding to criticism of the FLI letter.

True: Marcus's Twitter/X account shows a long tweet or thread, posted on the morning of 2023-03-30 (in his local time zone, US Eastern or Pacific), that addresses criticism of the Future of Life Institute pause letter. Mostly true: such a long post or thread exists from 2023-03-30, but its time of posting or its topic differs slightly (e.g., early afternoon, or it addresses the letter generally rather than the criticism of it). Mostly false: the relevant post was made on a different day, or was short rather than long. False: archives of his account show no post about the FLI letter from that day.

Set before the research began.

1. E1 Experts criticise plan to pause AI research | ForkLog ForkLog · 31 March 2023

   “Another signatory—the psychology professor Gary Marcus—spent most of the day arguing with critics on Twitter, including computer science professor Nick Holliman.”

2. E2 Musk’s AI letter is a ‘hot mess’ of hype, say critics Business Times (Singapore) · 31 March 2023

   “The open letter, published on Wednesday on the website of the Musk-funded Future of Life Institute, called for a six-month pause in development of powerful AI systems.”

3. E3 Musk’s AI letter is a ‘hot mess’ of hype, say critics Business Times (Singapore) · 31 March 2023

   “Another signatory, psychology professor Gary Marcus, spent much of the day battling on Twitter with critics including computer science academic Nick Holliman, who accused him of taking part in a “silly distraction”.”

4. E4 Latest Twitter Threads by @GaryMarcus on Thread Reader App Thread Reader App · 6 January 2025

   “Mar 29, 2023 • 5 tweets • 3 min read”

5. E5 Experts criticise plan to pause AI research | ForkLog ForkLog · 31 March 2023

   “Another signatory—the psychology professor Gary Marcus—spent most of the day arguing with critics on Twitter, including computer science professor Nick Holliman.”

6. E6 Experts criticise plan to pause AI research | ForkLog ForkLog · 31 March 2023

   “— Gary Marcus (@GaryMarcus) March 29, 2023”

News reports from 2023-03-31 say Marcus spent much of a day arguing with critics of the FLI letter on Twitter (E1, E3, E5). They do not say which day, and they do not mention a long tweet or thread posted on the morning of 2023-03-30. Thread Reader App lists a 5-tweet thread dated Mar 29, 2023 (E4), and a news article embeds a Marcus tweet dated March 29, 2023 (E6); neither quote shows what the thread was about. Neither shows a long post from the morning of March 30, and none of the evidence shows that no such post exists. The evidence does not settle the timing or content the criteria require.