A Soccer-specific stadium is a term used mainly in the United States, Canada and Australia, coined by Lamar Hunt, to refer to a sports stadium either purpose built or fundamentally redesigned for soccer and whose primary function is to host soccer matches, as opposed to an all purpose stadium which is primarily used for soccer. These mostly refer to soccer stadiums in the USA. In the early history of the MLS, a lot of teams used NFL stadiums. Eventually, they got chased out. Some went to smaller stadiums, other football stadiums, or baseball stadiums. Some had the money and built their own park. With the opening of Livestrong Sporting Park, there's 11 soccer specific stadiums(for 12 teams). The first was in Columbus, then in 8 years 10 new stadiums were built. Here's a gallery.
Columbus Crew Stadium
The Home Depot Center
Los Angeles Galaxy, C.D. Chivas USA
Pizza Hut Park
Dick's Sporting Goods Park
Commerce City, CO
Rio Tinto Stadium
Real Salt Lake
Red Bull Arena
New York Red Bulls
Livestrong Sporting Park
Sporting Kansas City
Kansas City, KS
Those are the current ones above, but there are two still coming. Houston spent their history in the Houston Cougars' football stadium. The Earthquakes spent their recent return in the San Jose State Spartans' football stadium.
New Earthquakes Stadium
San Jose Earthquakes
San Jose, CA
The teams sharing stadiums are(not counting the Dynamo, and Earthquakes)
New England Revolution(Gillette Stadium, New England Patriots)
DC United(RFK Stadium, built for baseball)
Seattle Sounders(Qwest Field, Seattle Seahawks)
Vancouver Whitecaps(Empire Fields/BC Place, BC Lions)
In 2012, the Montreal Impact will be playing in a Soccer Specific Stadium of their own. They aren't in the league yet, and they built it in 2008, so it goes down here!