A billionaire, in countries that use the short scale number naming system, is a person with a net worth of at least one billion (1,000,000,000, i.e. a thousand million) units of a given currency, usually major currencies such as the United States dollar, the euro or the pound sterling.
 The American business magazine "Forbes" produces a complete global list of known U.S. dollar billionaires every year and updates an Internet version of this list in real time.
 The American oil magnate John D. Rockefeller became the world's first confirmed U.S. dollar billionaire in 1916.
 As of 2017, there are over 2,000 U.S. dollar billionaires worldwide, with a combined wealth of over US$7.6 trillion.
 According to a 2017 Oxfam report, the top eight richest billionaires own as much combined wealth as "half the human race".
The Richest Africans is an annual ranking of the richest African people, compiled and published by the American business magazine "Forbes" .
 The list has been published since 2015.
 Dangote Group founder Aliko Dangote has topped the 2016 list.
 In 2015, there was a record of 24 African billionaires on the list that included a record 9 newcomers from all over Africa.
Forbes ( ) is an American business magazine.
 Published bi-weekly, it features original articles on finance, industry, investing, and marketing topics.
 "Forbes" also reports on related subjects such as technology, communications, science, politics, and law.
 Its headquarters is located in Jersey City, New Jersey.
 Primary competitors in the national business magazine category include "Fortune" and "Bloomberg Businessweek".
 The magazine is well known for its lists and rankings, including its lists of the richest Americans (the Forbes 400) and rankings of world's top companies (the Forbes Global 2000).
 Another well-known list by the magazine is The World's Billionaires list.
Vroom.com is a New York City-based e-commerce company launched in August 2013 that allows customers to buy, sell and finance used cars online.
 It also has a refurbishment facility in Stafford, Texas and will be opening another in Whitestown, Indiana, in 2016.
 It was included on Forbes’ list of the Hottest E-Commerce Startups of 2015 and was named one of the Hottest Startups in New York City by Business Insider in 2015.
 Vroom’s CEO is Paul Hennessy , who was previously the CEO of Priceline.com.
Africa's Richest Kings is a ranking of Africa's wealthiest monarchs, compiled and published by the American business magazine, "Forbes", in March 2014.
 The total net worth of each individual on the list is estimated, in United States dollars, based on their assets and accounting for debt.
 Politicians and dictators whose wealth comes from their positions are excluded from this list, as the term king is deemed by the evaluators to refer to either sovereign or constituent monarchs who reign due to monarchical tradition.
PlayStation Underground is a now-defunct American video game magazine, originally published by Sony Computer Entertainment America.
 The magazine focused on PlayStation fanbase, including gaming on the original Sony PlayStation and the PlayStation 2.
 Unlike its paper-based counterpart the "Official U.S. PlayStation Magazine", PlayStation Underground came in the form of CD-ROMs which could be played on the PlayStation and PlayStation 2 consoles.
 The magazine released its first issue on March 26, 1997 and ended with its final issue in 2001.
 The Magazine released a total of seventeen issues during its active years.
 The magazine was eventually merged with "Official U.S. PlayStation Magazine" in 2001 when it was discontinued.
The World's Billionaires is an annual ranking by net worth of the world's wealthiest billionaires compiled and published in March annually by the American business magazine "Forbes".
 The list was first published in March 1987.
 The total net worth of each individual on the list is estimated, in United States dollars, based on their assets and accounting for debt.
 Royalty and dictators whose wealth comes from their positions are excluded from these lists.
Fortune 1000 is a reference to a list maintained by the American business magazine "Fortune".
 The list is of the 1000 largest American companies, ranked by revenues. Eligible companies are any which are incorporated or authorized to do business in the United States, and for which revenues are publicly available (this list has a larger universe than "public companies", as the term is commonly understood, meaning "companies whose common stock trades on a stock market").
 The Fortune 500 is the subset of the list that is its 500 largest companies.
HouseTrip is an online holiday rental marketplace that allows homeowners and holiday rental managers (known as ‘hosts’) to list and rent out their properties to guests.
 Headquartered in Lausanne, with offices in London and Lisbon, the privately held company has been ranked as one of Europe’s 100 hottest startups by Wired Magazine and as one of the 50 top websites for travel by The Times.
WillCall is a San Francisco-based startup company offering a mobile app for iPhone and Android devices that allows users to gain admission to live concerts, tip artists, and purchase merchandise during a show.
 It was named one of the Hottest Startups of 2013 by "Forbes".
 Since its inception, the company has become known for editorial curation, a UX driven product strategy, and social networking integration.
 It has been called "an Uber for nightlife — one that makes everything from attending shows to buying drinks and merchandise much easier," by TechCrunch.

Question: Which American business magazine released a list of Hottest Startups of 2013?
Answer: Forbes