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Facebook is down again (Thursday, September 23). For the thousands of you wondering what happened to Facebook, here is an update:

Yesterday, thousands of Facebook users reported that the site was down after a thrid-party networking provider caused some users problems connecting.

“We are experiencing an issue with a third party networking provider that is causing problems for some people trying to connect to Facebook,” the company said in a statement. “We are in contact with this provider in order to explore what can be done to resolve the issue. In the meantime, we are working on deploying changes to bypass the affected connections.”

Latency issues with the company’s API have been blamed for today’s issues, but they don’t appear to be related to what happened yesterday..

“We’re currently experiencing some site issues causing Facebook to be slow or unavailable for some users. We are working to resolve this issue as quickly as possible. This is unrelated to yesterday’s outage,” the company said in a statement.

From Mashable:

“Facebook started experiencing problems at around 2:30 PM EST. Between 2:30 PM EST and 3:30 PM EST Facebook only had 38.46% availability with sky high response times of up to 60 seconds reported from one of our monitoring locations. Over the last hour, AlertSite has recorded errors in all 12 of its monitoring locations throughout the US.”

Most users received the notice “Service Unavailable – DNS failure” when trying to access the site.

Facebook appears to be back up and running in most locations.