Columbia subject headings:
Crises.
Europe--Politics and government--21st century.
Europe--Social conditions--21st century.
Political participation.
Populism.
Social media.
Harvard subject headings:
Criticism--Germany.
Germany--Social conditions
Populism--Germany.
Radicalism--Germany
Right-wing extremists--Germany
Social change--Germany
Princeton subject headings:
Crises.
Europe--Politics and government--21st century.
Europe--Social conditions--21st century.
Political participation.
Populism.
Social media.