Dear all, Six hours ago i checked my keyword ranking all were ranking on page 1 or 2 some are on page 3 now suddenly all keyword ranking has gone . I have not change any thing on website in last 72 hours. I have not done any link building in last 72 hours. there is no warning or message from Google in my webmaster tool. does Google has change any thing in last 6 hours in algo or some thing which we don't know. Guys be aware...... does in past any one has come across this situations........... seeking help from all SEO gurus on BHW........ Thanks in advance.