Written communication is naturally more challenging than face to face verbal communication. These "short" communication modes make things worse, opening up all sorts of possibilities for misinterpretation and miscommunication.
I felt so shackled by IM conversations, that I disabled GChat earlier this year. I've rediscovered the telephone and how superior it is when I really want to understand the other person. The only modes of only written communication I employ now are blog posts, forum posts, and emails. They all give me the opportunity to thoroughly review my words before setting them free.