PHILADELPHIA — At 1:01 p.m. on March 13, 2008, David Thomsen gained either a passion or a problem. He isn’t sure which.
That day, Thomsen made a single Wikipedia edit on the page for the expression “Holy cow,” and then walked away from editing for two months.
Fast-forward five years, and on March 13, Thomsen spent the day editing discussion pages on the soccer players, pairs skaters and other celebrities of Estonia while occasionally turning his attention to the neglected Wikipedia pages for some antebellum Maryland congressional elections and a Korean pop song.
It was about four hours, and 90 edits, worth of digging in the Wikipedia weeds.
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Nowadays, that is a light load.
Five years after Thomsen made his first edit, more than 100,000 have flowed from his fingertips. A word is misspelled. A discussion page isn’t categorized. A link is broken.
He’s on it.
Philadelphia’s Thomsen, 74, a retired computer programmer, is a king of the WikiGnomes. With more than 120,000 edits and an eagerness to dive deep into the details of the digital encyclopedia, he spends about 10 hours each weekday behind the scenes to make the site better.
“You get caught up in this whole concept that this thing is not as well-organized as it should be, and I’m going to do better,” he said.
Thomsen’s edits, which put him in the top 200 of Wikipedians, escape the spotlight reserved for prolific article creators, but are crucial for the success of the site, observers said.
“The gnomes are like the cleaners that come in at night and clean the office at the business,” said Mary Mark Ockerbloom, who worked for the Chemical Heritage Foundation in Philadelphia on a special Wikipedia project. “You don’t necessarily see them, but, boy, if they weren’t there, it’d be a different place.”
Thomsen agrees. But since a stroke in January, he has begun to question whether his legacy could be more than that of a WikiGnome.
“There’s no point in doing more of those,” he said, adding that he had been thinking of focusing on writing entries.
Retiring has given Thomsen, who was married 10 years ago and has no children, plenty of time to apply his computer skills to Wikipedia’s 4.3 million articles.
He knows he can’t mine the minutiae of Wikipedia all by himself, though. Anyone can edit nearly all entries.
“I’m like a kind of missionary, kind of getting people to get involved,” he said.
Thomsen even uses his attire to call for help. When he’s outside the house, he usually wears one of the 15 blue-and-tan “Wikipedia Editor” caps he had made. People who express interest in the cap are potential co-editors, he said, though few join him in the cause.
When he ran out of the caps, he bought 15 more. Those went to Philadelphia Wikipedians who attended a picnic — or WicNic — he helped organize.
Jake Orlowitz, who helped, said that although he did not know Thomsen’s particular habits, many WikiGnomes cannot stop making edits.
“For people for whom Wikipedia consumes that kind of time, it is an absolutely addictive combination of a puzzle and a passion and a hobby, and, literally, in some cases, an addiction,” Orlowitz said.
A 2012 Wikipedia study of heavy editors found many of their edits were made due to a sense of compulsion, though more edits were motivated by self-fulfillment.
Thomsen does not think he’s addicted and says he finds the technical gnomish activities just plain fun.
Editing entries takes him across Philadelphia — to add photographs of every Carnegie library in the city with a fellow Wikipedian — and across the world — to a woman in Guyana to collaborate on a series about Guyanan bridges.
Thomsen also buys into the Wikipedia credo that information should be free. He’s not just a WikiGnome; he’s a public servant, he said.
His wife is pushing him to spend time on other things, he said.
“Men don’t like to hear things from their wives sometimes, and they hurt more when they’re exactly true than when they’re over the wall,” he said.
With the time he does spend on Wikipedia, he wants to focus more on article creation rather than minor edits. His hope is eventually to be on the list of the top 100 article creators.
He might not have the discipline to do it, he said, but that would be a real legacy.
Last week, the page for the vanquished logging town of Cross Fork, Pa., went live. He’s on his way.