New York (CNN Business) Facebook says it has fixed an issue that left some users in the United States unable to post photos or answer messages on Facebook or Instagram during part of Thanksgiving holiday Thursday.

In an update just after 3 p.m. ET, the company said that the issue is fully resolved. "We are back to 100% for everyone," a Facebook spokesperson told CNN Business.

The company said earlier on Thursday afternoon that it had identified "an issue in one of our central software systems." Facebook said that it "caused many people to have trouble accessing Facebook's family of apps," and that it had started to restore access.

There were thousands of complaints about both social networks being down as of 10:30 a.m. ET, according to the tracking site Down Detector.

Twitter. Parts of Instagram appeared to be affected, including the news feed being slow to refresh and trouble uploading pictures. The outage on Instagram sparked complaints on

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