@iamcal

Previously: Slack co-founder & CTO

 San Francisco, CA
iamcal.com/
Joined September 2006
  • Tweets3.1K
  • Following283
  • Followers10.4K
126Media
Cal Henderson retweeted
raina douris@RahRahRainaAug 25
when you scroll your phone: how sad. mindless. no inner life to speak of when i scroll my phone: haha! i am learning so much at an astonishing speed. these jokes are so unique
17
2,341
10
33,217
345,592
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…
2
1
16
1,535
Cal Henderson retweeted
Neil Renic@NC_Renic27 Mar 2025
I apologise for the delayed response to your email, I have enormous personal flaws that I refuse to work on
38
10,373
215
72,618
1,584,416
Cal Henderson retweeted
aizk ✡️
@Aizkmusic4 Feb 2025
wikitok.vercel.app/ It's 2:00 AM Who wants infinite scrolling wikipedia!!
314
758
196
8,629
710,770
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…
2
1
1
17
2,808
Cal Henderson retweeted
Matthew Siu
@MatthewWSiu12 Dec 2024
made a map that lets you discover wikipedia pages around the world 🗺️📌
282
2,053
1,064
28,450
6,683,110
choosing to open the twitter app again
76
5,867
254
68,852
1,628,125
Cal Henderson retweeted
Lionella@x_zaich29 Jun 2024
The calories aren’t empty if they are filled with joy
7
364
7
2,949
74,627
Cal Henderson retweeted
Meech@MediumSizeMeech24 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!!!!
32
4,764
260
41,485
1,170,511
Happy 10th birthday to Slack 🎉 Happy 20th birthday to Flickr 🎉 Time for me to take a little break 😅
24
8
5
463
67,061
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…
2
1
1
30
6,197
Cal Henderson retweeted
secret eris
@eris_nerung26 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
14
24
3
346
15,258
When you have back to back meetings
A picture from a recipe on WikiHow - step 8 says, let the potato rest for five minutes

ALT A picture from a recipe on WikiHow - step 8 says, let the potato rest for five minutes

17
109
5
916
66,674
Cal Henderson retweeted
MoonPie
@MoonPie18 Oct 2023
Sorry I haven't been checking DMs it's just that I don't want to and you can't make me
23
51
5
618
62,777
This is so much fun!
chris arvin@chrisarvinsf12 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 :)
photo of a dark map with bright green road lines, san francisco. text "66.81% of miles of street named"

ALT photo of a dark map with bright green road lines, san francisco. text "66.81% of miles of street named"

1
1
6
3,068
Cal Henderson retweeted
JP@jpbrammer19 Jul 2023
so sorry for my delay in getting back with you! I have been beset by calamities
24
7,783
361
27,042
2,125,252
Cal Henderson retweeted
Locus Magazine@locusmag10 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…
1
2
1
7
3,364
Parens are for (I mean this as a joke (yet a joke I agree with (more or less) right now) please understand) nerds.
3
7
81
3,265
Ok, maybe 3D printing is actually really cool
girly&wordly@Brieyonce27 Feb 2023
Allow me to introduce you to the most ridiculous yet amazing thing you will see this week.
14
4,072
Load more