Thanks for that one! It is a common and inexcusable error. I have a close friend who uses it that way all of the time in texts, and I just grit my teeth.
She also writes ect instead of etc, no matter how many times I write etc, and she writes ruff and tuff instead of rough and tough.
I want to ask her in a good-natured way how she came to start spelling ruff and tuff that way, but friends tell me it would be rude no matter how I asked.