Twitter community adds a context note to Joe Biden tweet:  The official Twitter account for the president tweeted, “House Republicans have proposed a new 23% national sales tax on American families, increasing the prices of everything from groceries and gas to food and medicine. American families need more breathing room. Not less.” Twitter added a label to the post that read "Readers added context they thought people might want to know.” The added context read "While the bill does institute a 23% national sales tax, it also eliminates the income tax, payroll tax, and estate tax. It also includes a number of refunds and credits in chapter 2, and further refunds and rebates for families in chapter 3." The note also included a link to support the assertion. The label is part of Twitter’s Community Notes system. Twitter users are able to sign up as contributors to add context to tweets.