Hi guys, I need a help on this. Last night my site (mostly) disappeared from SERPs... I'm shocked of course, but I can't figure out the reasons. Here is my site's info and situation. My sites ranked high on my main keyword and several others on home page, also ranked with other keywords on sub pages. The site is about 9 months old, and I gradually gave 10 backlinks from my blog network and 20 from some guy's private network. I focused on quality, not quantity. We kind of worked together and we slowly built the links - all together WMT recognizes 45 or so links (30 plus some duplicates = home page and individual posts). We didn't do it aggressively - diverse anchor texts and generic URL links etc. It gradually climbed up on SERPs with many keywords, but all of a sudden it is gone, except one of my main keywords that dropped from #1 to #12 - but this too sometimes disappears depending on when I check. There is no message on WMT, another site I use the same guy's network is unaffected, and there seems to be no major algorithm changes now. Just my site disappeared - BOTH home page and inner pages. (Some inner pages ranked OK, like page 2 or 3, with mid competitive keywords, they are gone). I used the Site:mydomain.com function and it shows normal results, my home page on top, with all pages indexed. No other errors on WMT. I do no keywords stuffing - rather diverse. Only thing I can think of is I added 50 more pages over past 10 days - it was originally 50 pages but the size doubled. However each pages has a lot of unique/original content (I wrote it on my own with my knowledge etc.) on the same/related topics. I'm really at a loss. Any advice would be appreciated. Thanks.