The \"Do Good\" hashtag is part of the Paul Walker Foundation's campaign to \"continue to do the work that Paul started,\" the organization's official website stated. It's also part of a challenge Meadow Walker personally started on Sept. 12, her father's birthday.

\"In honor of my dad's birthday today, we're challenging you to DO GOOD! Share a video or photo of your random act of kindness and nominate 4 people to join the challenge! Be sure to tag the foundation as well as hashtag #PWFdogoodchallenge, so we can check out all of your posts!\" she wrote next to a throwback photo of her and her dad.

In honor of my dad's birthday today, we're challenging you to DO GOOD! Share a video or photo of your random act of kindness and nominate 4 people to join the challenge! Be sure to tag the foundation as well as hashtag #PWFdogoodchallenge, so we can check out all of your posts! I nominate @marisamiller @vindiesel @meghanrochey & @lilchaseyk

A post shared by Meadow Walker (@meadowwalker) on Sep 12, 2017 at 7:24pm PDT

Last week would have been @PaulWalker 44th birthday and in celebration of that we invited you to join us to DO GOOD! We will be sharing some of the amazing stories and outreach over the next few weeks. Even the smallest random acts of kindness have big impact...thanks to all of YOU who are spreading his light around the world?? Share your DO GOOD stories, tag #PWFdogoodchallenge & nominate 4 friends to join us in this beautiful challenge!

A post shared by Paul Walker Foundation (@paulwalkerfdn) on Sep 19, 2017 at 3:35pm PDT

And the essence of that challenge certainly caught on. Paul Walker's former co-stars Vin Diesel and Jordana Brewster have followed suit, performing random acts of kindness.

\"We stopped in and made a donation, met with the youth that live there and the faculty that run the non profit organization, called Children of the Night. Proud of you all,\" Diesel said earlier this month in a video, then nominated fellow actors Gal Gadot and Robert Downey Jr. to do the same.

#Repost @vindiesel ··· We stopped in and made a donation, met with the youth that live there and the faculty that run the non profit organization, called Children of the Night. Proud of you all... Now I nominate @gal_gadot @neymarjr @robertdowneyjr @badgalriri A random act of kindness... #PWFdogoodchallenge

A post shared by Paul Walker Foundation (@paulwalkerfdn) on Oct 5, 2017 at 10:13am PDT

Brewster, who played Paul Walker's wife in the \"Fast & Furious\" films, donated to DonorsChoose.org.

#Repost @jordanabrewster ··· DO GOOD! ?? @paulwalkerfdn #pwfdogoodchallenge I nominate @lindagray_ @themichaelealy @realnatalietran @maxiboyer @donorschoose

A post shared by Paul Walker Foundation (@paulwalkerfdn) on Oct 1, 2017 at 10:15am PDT

And it's all about continuing Paul Walker's legacy.

\"His passion for the ocean, his passion for rescuing animals, his passion for helping people and his passion for spontaneous goodwill. I wanted to start this foundation because I want to share that piece of him with the world. I want to share that part of him with others,\" she shared in 2015 after launching the foundation.

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