https://records-express.blogs.archives.gov/2017/01/27/record...

> Bulletin 2014-02 informs agencies that content created on social media platforms, including Twitter, is likely to be a Federal record and must be managed appropriately. For records posted on third-party social media platforms, agencies must determine how best to manage the records for the appropriate retention period and capture them where appropriate. Some social media records may be temporary, with a transitory, short, or long-term retention. However, some dispositions may be permanent, requiring the records to be preserved until their eventual transfer to the National Archives.