| AboveNet Enters Into Joint Venture to Bring Its Global Internet Network to Japan Speeding Internet Traffic and E-commerce Around the World
 
 SAN JOSE, Calif., Dec 13, 1999 (BUSINESS WIRE) --
 
 Joint Venture with Marubeni and Trans Cosmos Links
 Japan, the U.S. and Europe into One Seamless Network
 
 AboveNet Communications Inc., a subsidiary of Metromedia Fiber
 Network, Inc. (Nasdaq:MFNX), announced today that is has extended its
 global one-hop Internet network into Japan through a strategic joint
 venture, AboveNet Japan K.K., formed with two of Japan's largest
 companies and high technology leaders -- Marubeni Corporation and Trans
 Cosmos, Inc.
 
 The joint venture will have far-reaching effects for the flow of
 Internet traffic within Japan and between Japan and the United States
 and Europe. It will help streamline the routing of traffic between
 continents to improve the quality of content, media, and applications
 delivered over the Internet around the world. Marubeni owns fifty
 percent of the venture, Trans Cosmos owns ten percent, and AboveNet
 owns forty percent.
 
 "By extending our IP network to Japan, AboveNet is breaking new ground
 in the evolution of the Internet as a global medium. AboveNet Japan
 will tie Japan and other Asia Pacific countries more closely to U.S.
 and Europe and it will create a seamless global optical IP
 infrastructure unsurpassed for speed and performance," said Sherman
 Tuan, AboveNet CEO. "For the first time, Internet users on multiple
 continents will be able to navigate the Web and obtain the information
 they want without leaving AboveNet's network."
 
 AboveNet Japan will build an Internet Service Exchange facility in
 Tokyo modeled after AboveNet's state-of-the art facilities in the U.S.
 and Europe and designed to meet local requirements. It is scheduled to
 open in the second quarter of 2000. Japanese ISPs, content providers,
 e-commerce companies, and enterprises will for the first time be able
 to co-locate their Internet equipment in a secure, fault-tolerant
 regionally based co-location facility built to AboveNet's quality
 standards, and obtain fast, reliable Internet connectivity via
 AboveNet's high-performance global network.
 
 AboveNet Japan, which builds upon AboveNet's momentum in the Asia
 Pacific Region, is part of AboveNet's strategy to expand its facilities
 globally and transform the performance of the Internet around the world
 through a superior network and an infrastructure of high performance
 international ISX facilities that are locally owned and operated.
 AboveNet UK, AboveNet Deutschland, and AboveNet Communications Austria
 were formed with local experienced Internet partners and are now
 operating facilities that speed Internet traffic in Europe and between
 Europe and the U.S.
 
 AboveNet Japan, like AboveNet's European joint ventures, will access
 AboveNet's broadband network, which has a current total bandwidth
 capacity of 24.7 Gbps, and it will take advantage of AboveNet's peering
 agreements with more than 300 ISPs and major network providers around
 the world. It will serve Japanese clients and others in the Asia
 Pacific region linking them together and to the U.S. and Europe on
 AboveNet's global one-hop network. Also, like all of AboveNet's ISXs,
 it will benefit from the end-to-end optical IP network AboveNet is
 building with dark fiber provided by Metromedia Fiber Network,
 AboveNet's parent company.
 
 AboveNet Presence in the Asia Pacific Rim Region
 
 A large number of Asia Pacific Rim ISPs currently co-locate their
 equipment and obtain Internet connectivity at AboveNet's San Jose ISX.
 Among theses providers are AT&T Asia Pacific of Hong Kong; Loral Orion
 Asia Pacific of Singapore; Hinet, SeedNet and AUNET of Taiwan;
 Singapore Telecom of Singapore; Linkage On-line and HKNet of Hong Kong;
 KDD and Mitsubishi Electric Information Network (MIND) of Japan; DACOM
 and Korea Telecom of Korea; I-Phil.net and Globe Telecom of the
 Philippines; and Netspace, Vicnet and Paradox of Australia. These
 providers are expected to continue their presence at AboveNet's San
 Jose facility, where many exchange traffic among themselves as well as
 obtain Internet connectivity to the U.S. and European markets. AboveNet
 Japan will offer these and other Asia Pacific providers the option of
 co-locating their equipment and obtaining connectivity in a local
 facility.
 
 About Marubeni Corporation
 
 Marubeni, established in 1858, is one of Japan's leading general
 trading companies.
 
 Marubeni's operations encompass domestic, import, export and offshore
 trade and investment activities, and range from the development of
 natural resources to the retail marketing of finished products and
 consolidated total volume of trading transaction was $98.8 billion in
 its fiscal year ending March 31, 1999.
 
 Marubeni has 8,600 employees and conducts these operations through a
 worldwide business network comprising almost 200 representative offices
 and around 700 affiliated companies in 79 countries. For more
 information, please visit the Marubeni's Web site at
 marubeni.co.jp.
 
 About Trans Cosmos Inc.
 
 Trans Cosmos, headquartered in Tokyo, Japan, supplies data processing
 and data entry service, develops software, sells computer-related
 products, and provides Internet networking and marketing services
 solutions. Through joint ventures and strategic alliances, Trans Cosmos
 integrates viable technologies into the products and services it
 offers. Trans Cosmos also actively pursues new technologies through
 direct investments and investments through its subsidiaries in the
 Unites States venture capital market. With more than 600 customers and
 1998 revenue of more than 35.5 billion yen, Trans Cosmos is one of
 Japan's largest companies. For more information about Trans Cosmos's
 U.S. subsidiary, visit the company's Web site at
 trans-cosmos.co.jp.
 
 About AboveNet and Metromedia Fiber Network
 
 AboveNet Communications, the architect of the global one-hop network
 and a leading provider of Internet connectivity and co-location
 solutions for high-bandwidth and business critical applications, is a
 subsidiary of Metromedia Fiber Network. Metromedia Fiber Network is
 building metropolitan fiber optic infrastructure in the local loop in
 strategic major metropolitan markets, enabling technologically
 sophisticated organizations to implement the latest data, video,
 Internet and multimedia applications. The combined company will
 facilitate the explosive growth of e-commerce and advanced Internet
 applications by delivering secure, reliable and scalable optical
 networks to Internet content and service providers, carriers and
 enterprise users worldwide. For more information on AboveNet and its
 service offering call 800/475-2733 or visit the company's Web site at
 www.above.net. For more information about Metromedia Fiber Network,
 please visit the company's Web site at www.mmfn.com.
 
 This news release contains certain forward-looking statements that
 involve risks and uncertainties. Factors that could cause or contribute
 to such risks and uncertainties include, but are not limited to,
 general economic and business conditions, competition, changes in
 technology and methods of marketing, and various other factors beyond
 the Company's control. This also includes such factors as described
 from time to time in the SEC filings by Metromedia Fiber Network,
 including the most recently filed Forms S-3, 10-K and10-Q.
 
 Note to Editors: AboveNet, Internet Service Exchange, ISX, and AboveNet
 Global One-Hop Network are trademarks of AboveNet Communications, Inc.
 All other company or brand names may be trademarks of the respective
 companies with which they are associated.
 
 Copyright (C) 1999 Business Wire.  All rights reserved.
 
 Distributed via COMTEX.
 -0-
 CONTACT:       AboveNet Communications
 Rose Marr, 408/367-6681
 rose@above.net
 
 WEB PAGE:      businesswire.com
 
 GEOGRAPHY:     afxap CALIFORNIA INTERNATIONAL ASIA PACIFIC
 
 INDUSTRY CODE: COMPUTERS/ELECTRONICS
 INTERNET
 NETWORKING
 PRODUCT
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