Twitter community adds a context note to Shelby Talcott tweet:  Semafor reporter Shelby Talcott tweeted, “Trump’s team is giving out these hats at the Iowa state fair ahead of his visit tomorrow:” The tweet included a photo showing a hat that read "President Donald Trump - Back to Back Iowa Champ - 2016 * 2020." Twitter added a label to the post that read, "Readers added context they thought people might want to know.” The note added that, "Trump did not win the 2016 Iowa caucus. Ted Cruz did." The note also included a link to support the claim. The label is part of Twitter’s Community Notes system. Twitter users are able to sign up as contributors to add context to tweets.