Previously: Slack co-founder & CTO
Joined September 2006
- Tweets 3,044
- Following 273
- Followers 10,428
- Likes 115,136
125 Photos and videos
Jan 6
I've updated my 2025 reading list with the 121 books I read in the year. Highlights were The Thursday Murder Club by @richardosman, Piranesi by @susannaclarke_, The Repeat Room by Jesse Ball and Little Eyes by @sschweblin.
iamcal.com/misc/reading-list…
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Cal Henderson retweeted
27 Mar 2025
I apologise for the delayed response to your email, I have enormous personal flaws that I refuse to work on
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Cal Henderson retweeted
4 Feb 2025
wikitok.vercel.app/
It's 2:00 AM
Who wants infinite scrolling wikipedia!!
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6 Jan 2025
I've updated my 2024 reading list with the 88 books I read in the year. Highlights were Oryx and Crake by @MargaretAtwood, The Husbands by @hollygramazio and Dungeon Crawler Carl by @mattdinniman
iamcal.com/misc/reading-list…
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Cal Henderson retweeted
12 Dec 2024
made a map that lets you discover wikipedia pages around the world 🗺️📌
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Cal Henderson retweeted
30 Nov 2024
choosing to open the twitter app again
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Cal Henderson retweeted
29 Jun 2024
The calories aren’t empty if they are filled with joy
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Cal Henderson retweeted
24 Apr 2024
Just read an article I’ve had open in my tabs for four months. Anything is possible!!! Keep going! You can do it!!!!
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12 Feb 2024
Happy 10th birthday to Slack 🎉
Happy 20th birthday to Flickr 🎉
Time for me to take a little break 😅
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16 Jan 2024
I've updated my 2023 reading list with the 105 books I read in the year. Highlights were The Future, by @NaomiAllthenews, Station Eternity by @mightymur and Titanium Noir by @Harkaway
iamcal.com/misc/reading-list…
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Cal Henderson retweeted
26 Nov 2023
i've been going through the tabs i left open "to read later" and actually reading them so that i can close them, but this is actually increasing the overall number of tabs
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Cal Henderson retweeted
31 Oct 2023
When you have back to back meetings
ALT A picture from a recipe on WikiHow - step 8 says, let the potato rest for five minutes
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12 Sep 2023
This is so much fun!
12 Sep 2023
sf friends, here's my lil' challenge for you: what % of san francisco's street network can you name from memory?
carvin.github.io/sf-street-n…
just start typing names and press enter :)
ALT photo of a dark map with bright green road lines, san francisco. text "66.81% of miles of street named"
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Cal Henderson retweeted
19 Jul 2023
so sorry for my delay in getting back with you! I have been beset by calamities
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Cal Henderson retweeted
10 Jun 2023
The Locus Awards are coming up!
We are thrilled to announce @Iamcal, co-founder/CTO of @slackHQ, will sponsor #LocusAwards for 2023 & 2024.
locusmag.com/2023-locus-awar…
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Cal Henderson retweeted
1 Mar 2023
Parens are for (I mean this as a joke (yet a joke I agree with (more or less) right now) please understand) nerds.
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27 Feb 2023
Ok, maybe 3D printing is actually really cool
27 Feb 2023
Allow me to introduce you to the most ridiculous yet amazing thing you will see this week.
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Cal Henderson retweeted
10 Feb 2023
How strange it is to be anything at all
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