If you’re a person who needs or wants to improve their English writing skills, like E.S.L. students – for example, I have a suggestion for you. You don’t need to be deprived of the fun of writing in the abbreviated internet lingo: “Ppl cn get ‘way w a zillion mstakes coz erryone is equl on da Internet!” This writing is here to stay, but it won’t replace standard English – not for a long time, at least. The reason should be obvious: without a measure of standardization, no one would ever be accountable for what they say. So it behooves the ESL learner to practice writing perfectly as well. Both styles have their merits. My advice is as follows: NEVER MIX THE TWO. Decide (randomly is okay) which way you’re going to write and stick to it, for that particular communication and that particular time.