However, he was best known as editor of the socialist humorous magazine Hvepsen ("The Wasp"), which he started in 1905 after a fundraiser among trade unions.
The magazine is viewed as qualitative and successful during its time, and attracted skilled writers such as Johan Falkberget.
In 1916 Østerholt started another magazine as a side project, Blinken ("The Blink"), and in addition he wrote several poems and songs for events in the labour movement.
[1] Because of a large work burden, Østerholt had to leave his paper store and Arbeiderkalenderen with the Labour Party in 1913.
Østerholt joined the Social Democratic Labour Party, and as a result he was evicted from Folkets Hus in 1922.