Over these couple of days, there are alot of speculation about drop / fluctuation of organic rankings of websites. Here is the analysis found by SE Roundtable:-

Over the past few days the SEO communities and forums have been in a somewhat state of stress watching their rankings and analytics fluctuate up and down. It is like Google is tweaking things in real time and the search results are very unstable. I am not sure I’d call it one of the many Google algorithm updates we’ve been covering but it does sure seem weird.

SEOs are saying their rankings are all over the place the past few days. I was suspecting there was some sort of update going on or maybe small tweaks but it is hard to say. The automated tools aren’t showing much in terms of fluctuations or changes but the community, or at least some of it, feels a bit nervous about what is going on.