While i'm typing this;more than 40,000,000 people registered for an account.
As of 3/2012, 23,947,152 people have registered the game. So figure how many friends have they told about it?
It is impossible to give an exact number, since many players are not registered, but as of 2014 there were over 100 million registered users.
14,622,189 people have bought a Minecraft account. And, it will continue to rise. Over 10,000 people buy the game a day, on average.
22357673 and increasing
About 47,500 people! Plus you can only have 1 account, so they're all different people.
You can have infinite account logged in at once, but even if you have a really good computer, most computers can only handle about 2-4 Minecrafts open at once. Before your Minecraft crashes, and close automatically.
23.5 million and counting! Adding about one every second.
None hates minecraft
As of 2008, 17,304,091 people were registered to vote in CA.
You do not need a Minecraft account to set up a server, so unlimited. However most computers can only run one server at a time
I don't have it
Not quite sure of your question? If you mean how many can play off of one downloaded Minecraft app on one computer, I don't think there is a limit. Every one must have there own account and log into the game when the last person is done playing is all you need to do. Minecraft keeps track of every log in so there's a drop down menu that will show each players account that you just click on. For example, you have one computer and 5 people in your family that want to play Minecraft. All 5 will have to have there own Minecraft account in order to play with their own maps and saves. You just have to take turns.