Post about our website and products to different niche forums

We are looking for a social media person, who will find new forums /in addition to those, that we will provide/ and places, where to post content from our website /promotions, feedback, info for our products/. As a first task we need 200 postings. These does not to be too long - 3-4 sentences, plus mention of our brand or/and brand products. Mostly feedback and recommending our brand also announcing our promotions.