Is "I personally" incorrect?

Question

Every time I hear someone trot out the phrase "I personally" it grates against my ears.I wouldn't mind so much, but it very commonly used by a wide variety of people.I grates most because I'm not sure anymore whether this is correct grammatically.Is it legal in American but not British English (or vice versa)?So, could someone solve this conundrum for me, finally, please?

Answer 1

It is redundant.

So not that different from saying "a dark night" or "wet water."

You would not write "I personally think..." in formal writing, because in formal writing you wouldn't be using "I," and there's no need to precede a sentence with "I think" because it's YOU writing it, and so in non-fiction it's all either a fact or what you think.