EnglishCaptain Mark Kelly is on Twitter (X) as @CaptMarkKelly, with 526,288 followers and 7,018 posts. A typical post draws 968 interactions, an engagement rate of 0.184% per follower. It has been on X since August 2009, an account age of 17 years.
Engagement
A typical post picks up 968 interactions against 526K followers, an engagement rate of 0.184%. Measured over 42 original posts, its engagement rate beats 80% of 20,182 tracked accounts of a similar size. Comparing inside a size band matters here: engagement rate falls as accounts grow, so a raw rate would mostly just re-measure the follower count. Posts are seen about 17K times each, and 5.81% of those impressions turn into an interaction. That is about 3.17% of the follower count, which is the gap between an audience on paper and an audience in a timeline.
Measured over 42 original posts from a 30-day window, last computed on October 16, 2026. Recurring tags: #nv02, #va05.
Full engagement reportFollower growth
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Bio
Navy combat veteran and retired NASA astronaut. Husband to @GabbyGiffords. United States Senator for the great state of Arizona.
Notable followers
The biggest accounts in our directory following @CaptMarkKelly.
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Captain Mark Kelly on Twitter (X) - frequently asked questions
- What is the Twitter handle for Captain Mark Kelly?
- Captain Mark Kelly posts on Twitter (X) as @CaptMarkKelly. The profile is at x.com/CaptMarkKelly, and the View on X button at the top of this page opens it.
- How many followers does Captain Mark Kelly have on Twitter?
- Captain Mark Kelly (@CaptMarkKelly) has 526,288 followers on Twitter (X). The count is refreshed continuously from public data.
- When did Captain Mark Kelly join Twitter?
- Captain Mark Kelly joined Twitter (X) in August 2009. The @CaptMarkKelly account is 17 years old. Searches for Captain Mark Kelly age often mean a personal age, which we do not publish. The figure here is the account age only.