The hardline Indigenous activist group that promoted last Friday's ''invasion day'' rally has gone to ground after an expletive-filled Facebook post that demanded Australia be abolished.

The Warriors of the Aboriginal Resistance said in the post that Australia should be abolished, "not just Australia Day".

The statement, which began with the words "F--- Australia", called for the "decolonisation" of the country.

In response, Indigenous academic and activist Marcia Langton described the group on Twitter as a "white anarchist group" and "keyboard warriors who ghostwrite the imaginary blacks struggle".

Professor Langton declined to comment further when contacted by Fairfax Media.