The number of such 'logged out' users is somewhere around 500 million. The change means that if you click on a tweet that appears in a Google search, for instance, you may see ads on that tweet page or on the tweet creator's profile, reports stated.

Many advertisers think Twitter does not have enough registered users - especially compared to Facebook.

But the company has argued for years now that its audience is much bigger than the 320 million people who log in each month, and it has been telling media that it can make money off people without Twitter accounts. Now it's finally doing that.