A new report published by a social media tracking site Twopcharts revealed that 44 percent of the Twitter accounts never tweeted.

Three months ago, Twitter had an active 646 million active registered users which are now at 974 million. The number of signups is at an average of 135,000 per day which suggests that the site remains effective in attracting new users. However, convincing majority of the users to use the service to tweet remains a challenge.

According to a statistics released by Twopcharts, only 44 percent, or 428 million, of the active registered users have never sent a tweet. The discrepancy between the active users and the active tweeters lies on how Twitter defines "active" registered users-as long as someone is logging in, the user is considered "active" whether that user tweets or not.

Furthermore, there were users who have tweeted once upon signing up, but never tweeted again for the past 30 days. This suggests that these users tried the service but decided not to reuse for reasons unknown.

The Wall Street Journal asked for comments from a Twitter spokesperson who refused as the question is related to third-party data.

A low user engagement rating should be alarming, according to WSJ, as it suggests the actual number of people who enjoy using the service that reflects the advertising revenue of the business.

Meanwhile, Twitter continues making enhancements on its service. Just recently, it rolled out a new design for new users' profiles with a "big theme" similar to that of Facebook but bigger. The same week, the company also reportedly acquired screen customization app "Cover" for possible mobile expansion and redesign of the mobile platform. In addition, it is also welcoming 15 new types of ads to attract more users in the next six months and generate more ad revenue.