EnglishJack Clark is on Twitter (X) as @jackclarkSF, with 154,579 followers and 32,398 posts. It has been on X since October 2009, an account age of 16 years.
Engagement
Early reading. We have captured 7 original posts for this account, below the 8 we require before treating a median as settled. The numbers above describe what we have seen so far, not a finished profile of the account.
A typical post picks up 186 interactions against 155K followers, an engagement rate of 0.125%. Posts are seen about 21K times each, and 0.888% of those impressions turn into an interaction. That is about 13.5% of the follower count, which is the gap between an audience on paper and an audience in a timeline. Posting runs at about 0.7 post a day over the last 30 days, with activity on roughly 50% of days.
Measured over 7 original posts from a 30-day window, last computed on September 25, 2026. Recurring tag: #votenature2026.
Full engagement reportFollower growth
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Bio
@AnthropicAI, writer @ Import AI. Past: @openai, @business @theregister. Neural nets, distributed systems, weird futures.
Notable followers
The biggest accounts in our directory following @jackclarkSF.
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Jack Clark on Twitter (X) - frequently asked questions
- What is the Twitter handle for Jack Clark?
- Jack Clark posts on Twitter (X) as @jackclarkSF. The profile is at x.com/jackclarkSF, and the View on X button at the top of this page opens it.
- How many followers does Jack Clark have on Twitter?
- Jack Clark (@jackclarkSF) has 154,579 followers on Twitter (X). The count is refreshed continuously from public data.
- When did Jack Clark join Twitter?
- Jack Clark joined Twitter (X) in October 2009. The @jackclarkSF account is 16 years old. Searches for Jack Clark age often mean a personal age, which we do not publish. The figure here is the account age only.