Charleston resident Adrienne Levy wanted to do something in response to the tragic bombings at the Boston Marathon.

The 27-year-old runner asked some of her friends whether they'd want to meet for a Sunday run to show their support for Boston, and she asked others via Twitter to join them.

The idea caught fire.

“The power of social media took over, and now everyone wants to come,” the marketing account executive said. “This is amazing.”

Local print and broadcast media have been spreading word of the run, and interest has gone beyond what Levy expected.

“So many people were touched in some way by the tragedy,” said Levy, a Columbia native and avid runner. “The whole point of being together is to show Boston that the Charleston community is united (with them).”

The run will start at 8 a.m. Sunday at Colonial Lake downtown at the corner of Ashley Avenue and Broad Street. The informal 5K is free. It won't have chip timers, racing bibs or age group awards, but it will have spirit. A moment of silence will take place before the run, and participants are encouraged to wear one of their favorite racing shirts.

Levy also is applying for a city permit to secure a police escort before and behind the group.

Rick Martinez, founder of the Low Country Road Runners, has been helping Levy publicize the event and created a Facebook page for it.

“There's just this need, not just for runners, but for people to do something,” he said. “It's going to help local people heal.”

Runners are encouraged to join the Facebook group to give organizers a sense of how many people will be there. For more information, search for #chsrunsforboston on Twitter and Facebook.

Reach Diette Courrégé Casey at @Diette on Twitter or (843) 937-5546.