Blog and forum posting

We need manual blog posting related to our products. Posts must be unique and in answer to existing blog posts. Poster must research what blogs and forums to post on, register to post where needed, and maintain a spreadsheet online showing which posts have been made. Perfect grammar is a must. Poster must have very good command of English, and not come across as a non-native english speaker. Please make your quote per blog post. This is ongoing work. Can be full time.