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Twitter Introduced Custom Timelines (now called Collections) in Tweetdeck in November. These events were used for selecting parameters for the system.
Batkid can be characterised as a rapidly developing event, but without contradictory reports. Yale is also a rapidly developing event, but one where confirmed facts were slow to emerge. Lax is a media heavy event spanning just over 7 hours while Tornado spans 9 hours and is an extremely rapidly developing story, comprised mostly of photos and video of damaged property. Iran and Robford differ in update frequency but are similar in that related stories are widely discussed before the evaluation period.

LAX Shooting
A shooting occurred at around 16:20 UTC in Terminal 3 of the Los Angeles International Airport. Paul Anthony Ciancia, aged 23, has been accused of opening fire with a rifle, killing a U.S. government Transportation Security Administration officer and injuring several other people.
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Rob Ford
Embattled Toronto Mayor Rob Ford faces a council hearing set to debate a leave of absence motion in light of his admissions of crack cocaine use, though the defiant chief magistrate has given no sign at all that he intends to comply.
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Batkid
Batkid is the superhero name of Miles Scott, a five-year-old kindergartner and cancer survivor. Organized by the Make-A-Wish Foundation, the San Francisco Greater Bay Area chapter, the event was one of the largest and most elaborate Make-A-Wish projects ever staged.
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Tornado Outbreak
Dozens of Tornado warnings were issued affecting Chicago, Indianapolis, and other neighbouring regions in Illinois and Ohio. The 'High Risk' area for tornadoes had a combined population of 18M people. Damage in affected areas varied, multiple reports were issued.
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Iran
The Geneva interim agreement on the Iranian nuclear program was a pact signed on 24 November 2013 between Iran and the P5+1 countries in Switzerland. It consists of a short-term freeze of portions of Iran's nuclear program in exchange for decreased economic sanctions on Iran. UN Secretary General Ban Ki-moon hailed the interim agreement as the potential "beginnings of a historic agreement."
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Yale Incident
Police received a call from someone saying their roommate was on their way to the Ivy League school to shoot people. A lockdown was immediately issued as law enforcement from several agencies descended upon the university and began going room to room to search of the campus. The call was later revealed to be a hoax.
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After the system was tuned, a number of older and more recent events from 2013 and 2014 were selected to evaluate how the system can perform in production.

Westgate Mall Terrorist Attack in Kenya
A dozen or more assailants, armed with automatic rifles and grenades, had stormed the mall around lunchtime. Al-Shabab, the Somali Islamic extremist group claimed responsibility for the incident, which it characterised as retribution for the Kenyan military's deployment in Somalia.
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Metronorth Train Derailment
A New York City commuter train rounding a riverside curve derailed Sunday, killing four people and injuring more than 60 in a crash that threw some riders from toppling cars and swiftly raised questions about whether excessive speed, mechanical problems or human error could have played a role.
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Nelson Mandela Dies
On 5 December 2013, Nelson Mandela, the first President of South Africa elected in a fully representative democratic election, died at the age of 95 after suffering from a prolonged respiratory infection. Reactions from governments, international organizations, and notable individuals, gained worldwide media coverage.
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Paul Walker Car Crash
Best known for his role in "The Fast and the Furious" movies, Paul Walker died Saturday afternoon after a single-car accident and explosion in Southern California.
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Flight MH370 Disappears
Malaysia Airlines Flight 370 (MH370/MAS370) was a scheduled international passenger flight from Kuala Lumpur to Beijing that lost contact with air traffic control on 8 March 2014, less than an hour after takeoff. Malaysia Airlines reported the flight missing.
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Russian Military Intervention in Crimea
Following the events of the 2014 Ukrainian Revolution, a secession crisis began on Ukraine's Crimean Peninsula. On March 8th members of the OSCE mission were prevented from entering Crimea. Separately, a military truck broke down the gates of a Ukrainian base in the port city of Sevastopol and the installation was under siege by pro-Russian troops.
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Chasing Satoshi Nakamoto
Newsweek outed Bitcoin creator Satoshi Nakamoto as a 64-year-old man from Temple City, Calif. who goes by Dorian S. Nakamoto. He denied having any involvement in the digital currency after reporters chased the man across Los Angeles.
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White House Correspondents Dinner
The annual dinner, begun in 1920, has become a Washington, D.C., tradition and is usually attended by the President and Vice President. The dinner is traditionally held at the Washington Hilton. The dinners have drawn increasing public attention.
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Apple at WWDC14
The Apple Worldwide Developers Conference (WWDC) 2014 took place in San Francisco with an in-depth look at the latest in iOS and OS X. Apple introduced a number of new features in their 2014 keynote address.
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Insight Research conducted with the financial support of Science Foundation Ireland (SFI) under Grant Number SFI/12/RC/2289.
I. Brigadir, D. Greene, and P. Cunningham. "Adaptive Representations for Tracking Breaking News on Twitter", CoRR, abs/1403.2923, 2014.
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