Wall Street Journal: Facebook had the media world buzzing last month when it debuted its Instant Articles product, which lets media companies publish content directly to the social network. Five companies. including BuzzFeed, the New York Times and National Geographic, published content to Facebook on May 13, but no Instant Articles have appeared since. That has led some to question the success of the initial trials. According to publishing execs familiar with Facebook’s plans, the company intends to post more Instant Articles later this month.