To Smile E. Face: Your equation of “yeshivish” with textspeak is correct, and both are unwise because they lack the precision of a standard language, whether that language is English or Yiddish.
As for your ability to communicate with your friends using textspeak: the content of your communications with friends may be extremely limited. If you want to communicate outside your circle of friends, textspeak and yeshivish won’t work. That is why, for example, Sarah Palin’s use of Twitter for public discussion is appropriate for her: she is so simple-minded that 140 characters is all she needs to for her to believe that she has expressed a coherent thought, e.g., foreign policy i can see russia.