EVERYONE’S DOING IT: Marc Andreessen’s Sudden Silence on Twitter Stumps Silicon Valley.

Venture capitalist and technology evangelist Marc Andreessen has been among the most prolific Twitter users, deluging his more than half-million followers at all hours with wide-ranging witticisms, postulates and statistics.

So since he suddenly stopped tweeting last Saturday, his silence on the social-media site has been deafening in Silicon Valley. Techies and tech journalists have taken to Twitter to speculate about the mystery of his virtual disappearance, including his decision to simultaneously delete all of his previous tweets.

Mr. Andreessen, co-founder of venture firm Andreessen Horowitz, offered little explanation with his late-night announcement, simply tweeting: “Taking a Twitter break!”

He has since suggested that tweeting was taking too much time. “I feel 50 pounds lighter” without it, Mr. Andreessen said in an onstage interview at a tech event on Thursday, adding that he had archived all of his old tweets. On his behalf, a spokeswoman for his firm declined to comment.

I have to say, I feel the same way. You don’t realize how much headspace Twitter takes up until you get off. I’ve found myself much more productive on various projects as the Twitter-induced ADHD fades.