Activist and writer Cassandra Banks, based in Los Angeles, then spearheaded a social media campaign to track down him down.
Cassandra told i100.co.uk that seeing the initial photo of Sean "broke all of our hearts" and that she "want to do something nice for him" in response.
See her original tweet below:
Within a day she had tracked him down and he responded to her and the other campaigners over Twitter. Although he was out of the country at the time, he said he would be "free for an adventure" in two weeks.
She is now heading the team that will throw Sean an "incredible party" later this month. "We will make it awesome," she added.
Pharrell Williams tweeted Cassandra telling her to keep him posted about the party, while Moby has offered his services as a DJ.
When a Twitter user asked Andrew WK, supposedly the king of parties, if he would like to come, he wrote back "Of course! This guy is totally a dance party master and I'm backing him all the way."
On the GoFundMe page called "Dance party for #dancingman", a recent update describes that a "#dancingman meeting" held last night was a "great success".
"We started this so that we could dance with one man, who had been shamed from dancing in public," the post reads.
"Many of us know what it is like to not be comfortable in our own skin- and the photograph resonated with all of us."
- Independent