Prematurely closed this market based on data from early July. I'll resolve this market as soon as we have figures from end of the month.

At the moment, reports for monthly active users on X as of August 1 are not yet in. Similarweb reports X.com had 3.127 billion unique visitors in June, which is not the same as monthly active users and is a full month behind on the measure for the month ending August 1. Updates to follow.

Do you have a particular reliable source in mind for determining the number of users next month, specifically?

Because X is a private company, I will resolve this based on numbers reported by the company itself and consider any other reliable sources.

Do you have reason ro believe they will give a user count for August specifically?

I will refer on that date to numbers reported by Backlink. (https://backlinko.com/twitter-users#twitter-monthly-users) They source from: Statista, eMarketer, TechCrunch, X/Twitter 1, X/Twitter 2

It's currently falling. Here it says it's at 335.7

https://www.statista.com/statistics/303681/twitter-users-worldwide/

EDIT: I'm finding lots of different numbers from different sources. What source will you use to resolve this?

Here's the number from X, today:

Will you use a tweet/retweet by Elon Musk to resolve this market? Or is there another source you'll use?

The default metric for monthly active users of any social media are the companies themselves.