Brian C. Keegan – The Conversation

The idea of overpopulation has been used to argue against immigration. Pandagolik/iStock/Getty Images Plus

March 31, 2026

The long shadow of Paul Ehrlich’s ‘Population Bomb’ is evident in anti‑immigration efforts today

Brian C. Keegan, University of Colorado Boulder; Harvard University and Emily Klancher Merchant, University of California, Davis

In the 1960s and ’70s, his arguments also resonated on the left, including with the head of a powerful environmental group.

Mastodon est-il l'eldorado des déçus de Twitter? Davide Bonaldo/SOPA Images/LightRocket via Getty Images

November 21, 2022

Qu’est‑ce que Mastodon ? Un expert des médias sociaux explique pourquoi ce n’est pas le nouveau Twitter

Brian C. Keegan, University of Colorado Boulder

L’agitation qui règne sur Twitter a poussé de nombreuses personnes à se tourner vers une alternative, Mastodon.

Twitter users who are fleeing to the social media platform Mastodon are finding it to be a different animal. Davide Bonaldo/SOPA Images/LightRocket via Getty Images

November 11, 2022

What is Mastodon? A computational social scientist explains how the ‘federated’ network works and why it won’t be a new Twitter

Brian C. Keegan, University of Colorado Boulder

The turmoil at Twitter has many people turning to an alternative, Mastodon. The social media platform does a lot of what Twitter and Facebook do, but there are key differences.

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