The hashtag has been trending all day in the United States. A highlight of the diverse faces of people from the social media campaign #BlackOutDay. Twitter images clockwise from top left: ...

Back in 2007, Twitter user @chrismessina thought the hashtag would be a good way to make groups. He originally tweeted #barcamp - an international network of user-generated conferences primarily ...

Elon Musk launched a fire sale of Twitter office memorabilia after he bought the company. Ex-Twitter workers bought some pieces, including hashtag signs and art commemorating viral tweets. One Twitter ...