For 30 months, authorities had no luck tracking down an alleged MS-13 gang member wanted in the stabbing of a rival in Fairfax County.

They visited his house and chatted with his friends. They pried information from confidential witnesses. Nothing — just scraps of information that pointed to a man on the run.

Recently, authorities said, investigators turned to the Internet. They typed the man’s name into a search engine, and the fugitive’s Facebook page popped up.

In retrospect, it seems safe to say that Pride Arguis Arriola Najar had not perfected life on the lam.

Najar, 20, not only posted a photo of himself, mentioned his nickname, “Little Katra,” and professed his love of soccer, but he also provided other clues on the social-networking site that investigators found helpful. For example, authorities said, Najar listed his phone number and e-mail address. He even pointed out that he “lives in New Orleans.”

Fairfax police and agents with Immigration and Customs Enforcement tracked Najar to a mobile home community in Mandeville, La., north of New Orleans, where he was arrested Tuesday without incident, authorities said.

Fairfax police said Najar was charged with malicious wounding by mob in the Nov. 7, 2008, stabbing of a man at Route 7 and Payne Street in Falls Church. He had been wanted since early August on a federal charge of unlawful flight to avoid prosecution.

Police expect Najar to be brought to Virginia in the next month to face prosecution. Three others were convicted in the stabbing, and two suspects remain at large, police said.