Users of Twitter, whose main service allows broadcast of 140-character messages, were facing a delay of 25 minutes to 45 minutes.
By later on Monday, Twitter said the 'Timeline Delivery Issue' had been resolved, "Between 16:51 and 18:30 PST today , users experienced a delay in tweets appearing in their timelines. This issue has been fully resolved. We apologize for any inconvenience caused by this."
Written with inputs from Reuters.