Facebook went down for the third time in three weeks, with some users unable to access the social media site on Monday afternoon.

The messaging app was also down, although some messages were working. Some users reported the site was running, but very slowly, while many others were unable to access Facebook at all.

Facebook displayed the following message: “Sorry, something went wrong. We’re working on it and we’ll get it fixed as soon as we can.”

The site went down last Thursday across North America, Europe, Australia and India. Facebook later told Mashable it was “a configuration issue.”

Facebook users headed to Twitter to vent their frustration, with the hashtag #facebookdown trending and resulting in some funny tweets.

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As this is the third time Facebook went down in as many weeks, people are curious about why this is happening. Facebook is said to make millions in advertising revenue each day, so for the site to be down for even a short period means the company can loose large sums of revenue.

The company shares fell 4% from last week, although this is said to be a result of Facebook’s controversial Internet.org app, which provides free internet to developing countries.

The Wall Street Journal reported users of the app being unable to access Google and other sites, with some experiencing messages asking them to pay for data packages. Critics say this is a threat to internet neutrality. Facebook doesn’t allow sites to use SSL web encryption, meaning users of Internet.org are open to attacks.

Touted as a way to allow internet access for developing countries, all web traffic goes through Facebook servers, meaning Facebook controls users' access to the internet.