After being restricted to just a handful of cities for the first several months of its existence, Foursquare is now in a period of rapid expansion around the globe. Fresh of its launch of 15 European cities a couple week ago, today the site has rolled out support for 50, yes 50, new cities.

Though they haven’t formally announced the massive expansion yet, which pretty much doubles their total (they had 53 cities previously), Foursquare’s Harry Heymann tweeted about the addition today. And if you look in the site’s city drop down list, you’ll see a huge list of new cities.

After a quick scan, new ones I see include Oslo, Mumbai, Brighton, Tel Aviv, Tokyo, and a bunch in China (Beijing, Hong Kong, Shanghai) and Australia (Brisbane, Sydney, Melbourne). There also look to be a bunch of new U.S. additions like Bristol, CT, Columbus, OH, and Tucson, AZ.

Update: And here’s the official post on it. Complete with a list of new cities:

NORTH AMERICA
Charlotte, NC
Columbus, OH
Honolulu, HI
Louisville, KY
Memphis, TN
Nashville, TN
New Haven, CT
Oklahoma City, OK
Orlando, FL
Park City, UT
Providence, RI
Sacramento, CA
Tampa, FL
Tucson, AZ

Calgary, Canada
Edmonton, Canada
Ottawa, Canada

Mexico City, Mexico

SOUTH AMERICA
Buenos Aires, Argentina
Rio de Janeiro, Brazil
São Paulo, Brazil

EUROPE
Birmingham, UK
Bristol, UK
Brighton, UK
Cologne, Germany
Edinburgh, UK
Frankfurt, Germany
Hamburg, Germany
Lisbon, Portugal
Milan, Italy
Oslo, Norway
Reykjavik, Iceland
Vienna, Austria
Zurich, Switzerland

AFRICA
Johannesburg, South Africa

MIDDLE EAST
Dubai, United Arab Emirates
Mumbai, India
Tel Aviv, Israel

ASIA
Beijing, China
Bangkok, Thailand
Hong Kong, Hong Kong
Kuala Lumpur, Malaysia
Seoul, Korea
Shanghai, China
Singapore, Singapore
Tokyo, Japan

AUSTRALIA
Brisbane, Australia
Melbourne, Australia
Sydney, Australia

NEW ZEALAND
Wellington, New Zealand