I want to build a site like mylot!!!!!!!

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After 3 months, I am planning to host 2 websites & now am thinking of building one more that would be like mylot. But not totally like mylot. I have a rough sketch in mind how it should be. But I would like to know from you all that how should it be because I want to build it user friendly & such that the users are benifitted as much as I would by the site. So give me some suggestions.