How can i participate in beta version of twitter?

[mysara said]

How can i participate in beta version of twitter or it is for specific developers?

 

[Martindb]

The link where the app could be downloaded is no longer available according to the corresponding article on WP Central

 

[mysara said]

The link where the app could be downloaded is no longer available according to the corresponding article on WP Central

But when I click the link it is opened in store and reviews increases every time!