There have been plenty. Surely you aren't arguing that social media has never done so. Arguably social media has been one of the most catalyzing political forces in human history. And bearing in mind that "political action" can be in any direction, I found some examples. I didn't work very hard because this could have literally been a Google search on your part.

Arab Spring

Nepalese Discord Protests

Euromaidan revolution in Ukraine

2009 Iranian presidential election protests

2011 Egyptian revolution

#BlackLivesMatter

#MeToo

Hong Kong protests

#NoKings protests

Yellow Vest protests (France)

Anti-Israel/Pro-Palestine protests

Anti-vaccine protests during COVID

Rohingya genocide

GamerGate