A text that says "what are you doing?" could be interpreted by the recipient to mean what are they doing that very minute or it could be a critique from the sender asking the recipient what the hell they are doing, i.e. what's their problem. This rather simple example demonstrates lost in textlation.
When matters of relationships are discussed via text, that is where things can really become problematic.
Boy: You're the last person I'd want to hang out with.
Girl: Wait, what? Is he joking? Another one lost in textlation.
Emoticons are a lame ass way to make this easier.
Jen...still waiting....wondering why Steve hasn't called.
Jen should've used a smiley face to prevent her "humor" being lost in textlation. :)