"Dude bummer that u got caught," one poster wrote, 'but u made history and no one will forget that."
"Dang Colton," wrote another, "I was for sure you were NEVER going to get caught!!! Shucks!!!"
Harris-Moore's supporters recently began preparing for his arrest.
Shauna Snyder, who describes herself on her Web site as a criminal defense investigator and owner of Skepteon Investigations, is collecting the donations for Harris-Moore's legal defense fund.
"It is confirmed that Colton has been arrested in the Bahamas," Snyder wrote on her Web page dedicated to Harris-Moore. "Please donate to help protect Colton's rights."
She declined to tell ABCNews.com how much she had collected for the teen.
"Donations have been coming in," she said, "and there's been a lot of interest."
She wrote on her Web site that she met Harris-Moore while working on his defense team when he was 16 years old. She described him as a "friendly, polite and intelligent kid."
Kohler also posted a plea for donations, saying her son has been wrongly accused of crimes since he was a child.
"Now there's not a break-in or a theft in the entire Northwest that the media or law enforcement doesn't rush to pin on Colt," said Kohler in her online plea.
"We have no way of knowing what charges will be filed against Colt. The media has already convicted him as 'the Barefoot Bandit' and created widespread accusations and perception of guilt," the statement continued. "Eventually, though, Colt will have to fight for his freedom against the full force of the legal system."
The Associated Press contributed to this story.