An online campaign that aimed to raise US$5000 (NZ6278) to send a bullied bus monitor on vacation is winding down - after tallying more than US$700,000 (NZ$878,835).

As the monthlong campaign neared its end, a spokeswoman for the fundraising site Indiegogo said more than 30,000 people had contributed to 68-year-old Karen Klein, with donations coming in from 84 countries and all 50 states.

The fundraiser for the suburban Rochester grandmother was the idea of Max Sidorov, a 25-year-old Canadian who was moved by a 10-minute video posted online showing Klein enduring profanity, insults and threats from middle school students on a school bus.

Sidorov said he was as surprised as anyone with the final result of his posting, which also recorded nearly 28,000 comments.

"I think that people just love rallying around a great cause, especially helping someone in need or who has been abused or can't stand up for themselves," Sidorov said by phone from Toronto on Friday. "It just shows there are so many great people in the world. It warms my heart to see that."

The school system in the town of Greece has suspended four seventh-grade students for a year. At least three of the boys issued written apologies to Klein.

Sidorov said he will soon launch a new drive with a goal of US$7 million to combat bullying with counseling, a television series and a nonprofit social media website.

"Hopefully we can do a lot greater and bigger things stemming from what happened to Karen," he said.

"We keep in touch almost every day," he said. "We're good friends now."

The fundraiser ended on Friday at 11.59 pm Pacific time.

Klein didn't immediately return telephone messages left at her home.

- AP