語学学習、言語交換　（原則無料）
Ｌanguage Exchange.com
http://www.mylanguageexchange.com/
Likelanguage
http://www.likelanguage.com/en/?gclid=CPGC--Owo6wCFcYkpAodelW41w
Italki
http://www.italki.com/
My happy Planet
http://www.myhappyplanet.com/
Palabea
http://www.palabea.com/
Linggorilla
http://www.lingorilla.com/