Website suddenly went missing from Google SERP?

I got my site up and miraculously it reached the 2nd page of Google SERP when I type in my keywords.

I wanted to boost its position to the first page of the results so I submitted my website url to Digg.com, delicious, and another 2 social bookmarkng a few hours ago. That's all. I did nothing else.

Now.. when I search the keywords, my website went missing!!! What happened?!

I think it has no relationshiop with digg, delicious. Try to find anything else.