In one of my classes the other night, I sat through about 15 PowerPoint presentations, and not one person ever spelled their correctly when using it as a possessive pronoun. Everyone spelled it there, even those with erstwhile well-developed critical thinking skills.
Now, I can understand how easy it is to type there when you mean their–occasionally–but some of these people used it several times in their slide shows (oops–there slide shows) and never once bothered to proofread or correct it.
Then the scary thought came to me–they simply don’t know how to spell or use their correctly.
Have we–and American education–come to this?