Until 10 years ago, the purpose of the hash key on a computer keyboard was a mystery to most people. But on 23 August 2007, Chris Messina, Twitter's 1,186th user, took to the social media platform to ask people what they thought about the idea of using a "hashtag" to collate people and messages. To back up his idea, he tweeted #BarCamp to bring together comments about a tech conference series. Since then, it has become common parlance, offline as well as online, where it has become a key part of social networking, allowing users to access the latest content about one key subject at the tap of a button. It has expanded onto Facebook, Instagram and Tumblr, been featured in songs and has allowed a much greater analysis of trending subjects.
Now that the thrill of Black Friday and Cyber Monday has passed, it's time to think about ways your money can help charitable organizations and causes. Immediately after Thanksgiving, brands put out great deals, so people tend to binge shop from Thursday to Monday. Giving Tuesday, however, is the best day to get out your wallet and spend a little extra. Giving Tuesday was cofounded in 2012 by the Belfer Center for Innovation & Social Impact at the 92Y. Every year since then, the movement has encouraged philanthropy and connected individuals to participating organizations, which are listed here.
Demographics, in particular, gender, age, and race, are a key predictor of human behavior. Despite the significant effect that demographics plays, most scientific studies using online social media do not consider this factor, mainly due to the lack of such information. In this work, we use state-of-the-art face analysis software to infer gender, age, and race from profile images of 350K Twitter users from New York. For the period from November 1, 2014 to October 31, 2015, we study which hashtags are used by different demographic groups. Though we find considerable overlap for the most popular hashtags, there are also many group-specific hashtags.
A group of the "Chibok girls" freed from Nigeria's Boko Haram militants have been reunited with their families. The 82 girls, who were part of a huge group kidnapped from their school in 2014, are in the care of security services in the capital, Abuja. Their parents travelled by bus through the night to meet their daughters. More than 100 of the 276 girls, taken from the town of Chibok, are still being held by the militant group. The reunion in Abuja had a celebratory atmosphere, with music and dance.