What started as a single tweet has exploded into a powerful social media campaign fighting misogyny.

Days after a 22-year-old man with a grudge against women went on a murderous rampage in Santa Barbara, California, the hashtag #YesAllWomen is still trending on Twitter.

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The campaign's point is that while not all men are guilty of crimes to women, all women are affected by misogyny. All women have feared things men do, according to the Twitter user who launched the hashtag.

Countless men and women have joined in on the conversation: