From Ten poor word usages which will expose our lack of education and could damage a career. Including "hopefully":
"Everyone uses "hopefully" as a shortcut for "I hope." It is not. Yes, the dictionary allows it, but that's just bending to popular usage. In my book, there is only one correct use for "hopefully." It's a synonym for "prayerfully"—as in, "She looked up hopefully and said, 'Dear Lord, please make it rain soon, or we'll have no harvest.'" Do you want to say "I hope"? Then say "I hope.""
Read all ten, including since and because, and .everyone and they.