Eric Walker added John Carmack on Twitter to John Carmack

Eric Walker added John Carmack - Wikipedia to John Carmack

Eric Walker added John Carmack - Wikipedia and John Carmack on Twitter to John Carmack, and added John Carmack to Computer scientists and software developers

Eric Walker added a number of topics and a number of links to Computer scientists and software developers, and added Computer scientists and software developers to Scientists, researchers and academics and Computer science