NEW YORK—In what is being called a seminal moment in Internet history, a rare weekend post by 25-year-old blogger Ben Tiedemann on his website bentiedemanntellsall.blogspot.com rocked the 50 million-member blogosphere this Saturday. The landmark post, which updated nearly every member of the global online community on the shelf Tiedemann was building, was linked to by several thousand sites, including Daily Kos, Digg, and The New York Times. "Wow, what a special treat this was for all of us," said Talking Points Memo head blogger Joshua Micah Marshal, who, along with all other bloggers, checks Tiedemann's site every day just in case something monumental occurs. "I thought I was going to have to wait until Monday to find out if Ben decided to put [the shelf] in his bedroom or the living room. The pictures were great, too." Within two hours of going live, Tiedemann's 15-word post received 34,634,897 comments.