Hi to all, I am regularly doing Pligg sites submission in order to get good rankings for Google. The sites I am using are good .com sites having 80,000 alexa ranks and 2 or 3 PR. After 2 or 3 days of submitting my contents on these pligg sites, I inspected approved link URL whether Google has cached or not, but I got 404 error. But that pligg site home page was cached. Is it worth or submission is waste?? Will it bring Keyword ranking even we got that error on approved link page. Please answer my question.