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Second brain
1 creator use or recommend it
▲ 1 active in the last 90 days
1 recommend
Last discussed Nov 11, 2026
A second brain is a personal knowledge base that an AI can reference for context.
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New ChatGPT, Claude Whiteboards, Google Carbon: LIVE reaction
Greg Isenberg · Nov 11, 2026
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Greg Isenberg
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Used for: Feeding AI with timeless marketing fundamentals such as PDFs and transcribed books
Praised: Gives AI access to timeless knowledge
vs: Contrasted with second brains that only hold recent material
"I would also give those fundamentals to my second brain so that my AI is going and tapping into that, because I think that's a mistake a lot of people make: in their second brain, the references they're picking are stuff from 2025 and onwards, but..."
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