What sites/groups/communities would you target and how would you target them?
your target market is determined by your product or offering. you select your target customers based on your product and then you can choose demographics to reach potential clients keeping in view the income and age group. for example the focus of an interior designer will be homeowners within target income range. to divide market further you can divide your product in various specialized categories. for example for a furniture and fixture company the target market will be determined by various categories of furniture and fixture like home furniture and office furniture or kitchen or toilet fixture. once you have determined your target market you can then go and research specialized social media groups or websites and blogs for marketing your product to customers within defined target market. if you have website you can submit that to search engines by carefully choosing keywords that you can choose by researching how people find your competitors in the product space on search engines. for social media you can use hash tags to reach your target groups and to generate leads.