In honor of Twitter’s 10th birthday, here are the 10 most influential hashtags around social causes, ranked by the number of times they’ve been used since their inception. All numbers have ...

Please look at the time stamp on the story to see when it was last updated. Hashtags first started being used in the 1970s in the context of information technology, specifically, in programming ...

Today, Twitter is celebrating the 10th birthday of the iconic symbol with #Hashtag10. Let that sink in: The hashtag is 10 years old, which means there is an entire generation of children who will ...

Wednesday's birthday celebrations, of course, are trending with #Hashtag10. Today 125 million hashtags are exchanged every day, often serving as a springboard to launch massive online campaigns.