His employees Twitter they are constantly experimenting on new things. This time, it looks like they're testing pop-up warning messages online version of the known serviceof social networking.
According to sources, the new feature has not appeared in all accounts, which means that only a group of users can test it.
Twitter has not mentioned anything about the new feature, but has previously admitted that it is constantly testing new things in user groups.
If the experiment succeeds, we will all soon see the new feature.