The videos filled your Facebook and Twitter feeds for weeks. Everyone from your great aunt to your favorite actor to politicians jumped on the bandwagon and doused themselves with ice-cold water all in the name of charity.

Whether you love it, hate it or experienced the challenge’s chill firsthand, it’s official: The ALS Ice Bucket Challenge, in all its cold, wet glory, is a bona fide social media success. But it’s far from the first online marketing campaign to go viral. Here are five social media campaigns — and what you need to know about them — that have made a substantial impact on an organization’s efforts to raise awareness or funds for its cause.

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Did we miss one that stood out to you? Let us know in the comments!