But some petitions are more successful than others.

The petition-hosting site Change.org considers a number of factors in determining which had the biggest impact: the number of people who signed, the zeitgeist and the conversations sparked and whether anything changed as a result, said Michael Jones, the platform's managing director of campaigns.

"People really see online petitions as a tool to help them fix something that is systemically broken," Jones said.

Over the past decade, people took to Change.org to raise attention to criminal justice issues, honor community heroes and challenge pharmaceutical companies and other businesses.

These are 10 of the biggest victories, according to Change.org.

Justice for Trayvon Martin

The local tragedy soon became an international movement. Civil rights activists, politicians and protesters rallied behind Trayvon's family and took to the streets to demonstrate against his killing.

In April 2012, Change.org declared the petition a victory after a Florida state attorney announced that charges of second-degree murder would be lodged against Zimmerman.

Trayvon's parents and their attorney called the lawsuit "unfounded and reckless."

Preventing animal cruelty

Passing Caylee's Law

It was one of the first petitions of the decade to go viral, Change.org says, ultimately attracting more than 1.3 million signatures.

Saving Rodney Reed

Death row prisoner Rodney Reed was sentenced more than 20 years ago for the 1996 murder of 19-year-old Stacey Stites in Bastrop, Texas.

Reed says he is innocent, and attorneys from the Innocence Project say they have evidence that exonerates him. The lead prosecutor in his case maintains that he is guilty.

Honoring Nipsey Hussle

Getting TripAdvisor to address sexual assault

In June, K declared that the petition had been successful.

"With these updates, TripAdvisor has shown that they are committed to both improving the experience for survivors and providing people with the information they need to travel safely," she wrote. "I'm thrilled to declare our campaign a victory."

Ending the ban on gay Boy Scouts

After 12 years as a Scout, Ryan Andresen was told by his Boy Scout troop in the San Francisco Bay Area in 2012 that he couldn't receive the Eagle Scout award, the highest rank in the organization.

The reason? Because he had come out as gay.

Clemency for Cyntoia Brown

Years after her sentencing, her case gained widespread attention and inspired the viral hashtag #FreeCyntoiaBrown after A-list celebrities like Rihanna and Kim Kardashian West publicly advocated for Brown's release.

Restarting production of a cancer drug

Justice for Eric Garner

The petition received more than 144,000 signatures. Protesters interrupted the Democratic presidential debate in July to call attention to the issue, and New York Mayor and then-presidential candidate Bill de Blasio was asked why Pantaleo was still on the force.

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10 petitions that made the biggest impact this decade - CNN