Social bookmarking is a great way to get a lot of traffic quickly but it isn't targeted and for most people it won't generate a whole lot of money. SEO is the best way in my opinion to get valuable traffic but unless you are an expert at SEO this will take some time, but it varies depending on your keywords. Currently I see the best results from Forum posting and would recommend that method as it can also bring you some backlinks.
i think one day 100 traffic is not difficult.keep to go to many blogs or forums write your articles about your website's title