The site, which tracks crashes by compiling status reports from a number of sources, said nearly 15,000 users reported outages.
However, Twitter announced, minutes later, that it had fixed technical problems that caused the malfunction.
Users complained of being forced to leave the site and not being able to return, especially when using the Twitter application on phones.
People affected by the crash saw an error page indicating that they were not logged in, but there was no option to go back.
In contrast, others encountered more specific problems, which made them unable to tweet on the site, for example.