The three new hires include Jacob Thornton (@jacobthornton), Brian Larson (@balarson) and Shiva Rajaraman (@shivalr). Their hires bring the total number of people followed by Twitter's team list to 191, which we've been told includes contractors and other friends of the company.
Jacob Thornton (LinkedIn | Twitter) was most recently listed as a product designer for Threadsy, a unified social messaging startup that was a participant at TechCrunch50 in 2009. Jacob, a social media app designer, worked on the front-end for Threadsy, and his departure is likely the reason that Threadsy is looking to hire a front-end Web site and HTML ninja. (Given the job was posted 2 weeks ago and his start date is today, it seems more than coincidence)
In parallel, Jacob also is behind the project somelemonade, a visual reader for Twitter, Tumblr, Flickr, Picasa, YouTube and Vimeo. That side project recently crossed 500 users. He joins Twitter as a release engineer.
Obligatory First Day Tweetage from Jacob
Shiva Rajaraman (LinkedIn | Twitter) was the senior product manager at YouTube for Watch and Discovery, where he was in place since September 2006, a month prior to Google's $1.65 billion acquisition. Shiva joins Twitter as a product manager focused on monetization.
Brian Larson (Twitter | Google Profile) is most recently of Google. Prior to joining Google, Brian picked up a computer science master's degree from Stanford, and co-authored a paper on distributed recovery from attacks on peer to peer systems (see PDF) in 2002. He joins Twitter as a software engineer on the search team.