I agree with Rebecca. In my opinion, the purpose of a blog is to share your personality/expertise in your industry. Therefore, it defeats the purpose if the majority of your blog is based upon the writing of other people.

Plus, this might work against you because people will pick up on you referencing others work and might start going over to there blog instead of yours. I think the majority of the posts should be from you, but if you need a break there is nothing wrong with having someone write a guest post.

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LaTosha Johnson
http://www.targetstars.com