Hashtag activism refers to social movements that use hashtags to raise awareness for important causes on social media platforms. The document lists several prominent hashtag campaigns from the past decade related to civil rights, social justice, politics, and social issues including #BlackLivesMatter, #MeToo, #MarchForOurLives, #TimesUp, #BringBackOurGirls, and #LoveWins among others that aimed to spark conversation and mobilize supporters around the world through shared hashtags on sites like Twitter and Facebook.