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Conditions are changing rapidly at the Fukushima power plant, where at least two of its six nuclear reactors have partially melted down. The editors of Scientific American are following the developments, and part of the effort involves following various Twitter users.

Hard to believe, but Twitter is already five years old. To commemorate the occassion, the site's creator and Twitter's former CEO, Jack Dorsey has been retelling the company's founding story (through his Twitter page , natch). Here's an early exchange with Twitter co-founder Biz Stone: me: Biz! How goes

Instapaper is already a very popular service on mobile devices, and it's just had a big social sharing makeover that improves its offerings significantly. Best of all--and following current trends--a user's Instapaper "likes" are now browsable by friends.

In this excerpt from his new book The Thank You Economy, author Gary Vaynerchuk turns a critical eye to the Old Spice Man marketing campaign. What did the brand get right

Have you ever created a Genius playlist on iTunes or set up a station on Pandora? Just plug in one song, and you instantly hear music that matches your tastes.

1. Is there a new Net technology bubble underway? Twitter 's

Actor wastes no time posting on his new Twitter account, which now has more than 700,000 followers

"Two and a Half Men" star refers to his vices in first post to Twitter account