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Millions of Twitter users were unable to use the social network Tuesday, as the company suffered a major outage worldwide.

Users across Europe, the Middle East, Africa and North America reported having problems. The outages prevented many users on computers and smartphones from sharing and receiving updates and other messages.

Twitter users in northern Europe began to report issues Tuesday morning. Smartphone users there received the warning: "Tweets aren't loading right now." Several hours later, Twitter access became unavailable in the United States and Canada, at the start of the work day.

A statement on the company's Twitter page said, "We are aware of the issue and are working towards a resolution."

The on-again, off-again Twitter outages meant that the hashtag #twitterdown trended worldwide, as Twitter remained unavailable in many countries.

Once users were able to access Twitter again, many posted about what they did during the Twitter outage, instead of writing tweets or checking for updates.

One user tweeted: "With #twitterdown, I spent some time with my family. They seem like good people."