Marketing websites overseas

In todays media world, there is an overwhelming growth of social media marketing website where people go buy the most bare necessities as well as to list items they may have stored in their garage that are no longer in use. The problem that this has created is that the amount of websites out there offering the same services is diluting the amount of relevant sites. For example instead of having 1000 people looking into 10 websites (100 people per site) we now have 1000 people visiting 100 webs