Yahoo SERP

How would you explain the change of position of a website in the same day?

For example, sometimes my site is at the fifth position then 4 hours later at the 14th and back to 3 or 11 the day after and so on...

Now 37 or 38, I'm wondering about how is this happening
while the 1st is always the first!

 

this is call algoritham tweaking

 

I'm aware of this but on what kind of features is this making the changes?

 

im experiencing this one also, actually it only takes a minute when i got out of yahoo serp. then when i search back, i can see the results (has changed already). can you elaborate the "algorithm tweaking" thing?

 

I don't get many Yahoo serps.

 

I haven't noticed lots of movement. Maybe they have different centers like Google.

 

I sent to Yahoo the same comment, I'll tell you if they reply.

 

I was not expecting any answer but here it is and it took less than a day:

Well it does not make much difference

 

I contacted Yahoo today as well regarding my site going from first page to 3rd page. My server crashed while they were doing a update and it totally ruined everything for me.