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This in turn has caused a few of my rankings to plummet
Whooooah! Best example of jumping to conclusions that I've seen in a long time.
You've just added 2 + 2 together and made 5,567,321! Congratulations!
You state that:
google change snippet -> rankings drop
Usually the cause of this is...
you change content -> content no longer relevant to search (so snippet changes to use description) -> rankings drop
Have you changed anything on your site recently?
phish - I do agree with you in some respects. I have seen one or two websites that only have the meta description but i think that this may be a way to make the google results more 'tidy' Like Mr. said the drop of traffic could be anything but it sounds like it may have an effect.
Have you been included in Dmoz in the past few weeks?
Mr, dont be to quick to judge. (heh)
Fair enough. There are a number of reasons why his traffic has dropped. I was just suggesting the most likely based on the lack of information he gave.
I just thought it was funny that he jumped to the conclusion that it was the change in description that caused his SERPS to drop.
Both sites have seen dramatic rises in the SERPS over the past couple of weeks. (one in particular has gone from the mid-40s for the main phrase I'm after, to #11 - top of page 2, a significant "wee-haw!" moment inspiring a screen capture).
Google is either doing a serious tweak of Allegra, or maybe this is a whole new algo.