Unlike Facebook, Messaging Apps have a Conversationhttp://online.wsj.com/article/SB10001424127887323466204578382733261211950.html?mod=WSJ_hp_mostpop_read#project%3DHOWTOAPP%26articleTabs%3Darticle by DutchGrinner • 13 years ago 2 0 13 years agoONonline.wsj.com