President Obama crashed the social news site Reddit on Wednesday when he took part in an “Ask Me Anything” town hall. 

Four million people crashed the Reddit site. (Screengrab)

And now we know why.

According to numbers from Reddit, the Obama event was the most trafficked in the site’s history, with more than 4 million visits to this point.

The event was also the top-trending topic on Twitter on Wednesday afternoon, topping the GOP convention for a time.

And Obama’s campaign says the event led 25,000 voters to register on their Web site, including one 98-year old.

Reddit is a social news site on which users determine what content is the most important. Celebrities often use it to connect with fans.