Ok. The real did you know: In Sweden blood donors receive a text when their blood is used to save someones life.

Acknowledgment:

Donors receive a "thank you" text after donating.

Follow-up:
Donors receive a text when their blood is used to help someone.

Nudging:
Donors can opt-in to receive texts to encourage them to donate again.
The text message program was launched to: Combat low donation rates, Help donors understand the impact of their donations, Encourage donors to donate again, and Generate buzz on social media.
The program has been successful, generating a lot of visibility on social media and traditional media. It's also helped people talk about blood donation with their friends.

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sstronaut

That seems pretty cool to know when you have helped.

Also studies have suggested that 80% of people don't change from the default option, weather the person is willing to donate body part should something happen to them.

Which is why there should make some sort of law saying the default option should be to opt in to helping people.

Where if someone can easily change it if they wanted to.