Anyone Seen Any Pagerank Movement Yet?

Bisturi said:

I use Traffic Travis and while my PR (3) hasn't been changing over the last two months as I applied SEO, my Page Authority has gone down to 0 (it used to be 20), which could do due to a massive increase in backlinks that I got unintentionally.
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This happened to me I went to #8-9 on page 1 for my keyword rather wuickly like in two to three weeks then I think thru a FiveR gig I got 2k backlinks all from the same domain and pages on that domain. The site plummeted for over a month, just came back to 62 and today 61.

Another site that was not ranking in the top 500 just came into 32nd spot for a pretty competitive keyword and has held there for two days. Last week it popped into 44th was gone for two days out of top 100 and for last two days re-appeared in 32nd. The same thing happpened to me on this one. I ordered some Tumblr links/comments early on and and Google webmaster tools had the count at 1,300 tumblr links. I felt like this killed the site for the month as it was also only about 3 weeks old when I ordered the service. I have learned a ton since then and am a little hesitant on having service build my links for me.

I have a mature main site for my business that lost a spot last week and is in 5th spot and holding there. I am trying to pick and choose what I want to do with this one as I cant have it dancing. Needs to be improved but I cant risk it dropping. So White hat and buffer 2.0's at a minimum for that one.

Has anyone else seen these kind of numbers from certain links your built. You post a comment on a Word Press blogg, look into your links with Webmaster Tools or MS and there is a weird number accounted for, like 8 times the number of links you made on the same blogg? Ie you leave a comment on a page then the tools show many more comments on other urls from that domain...

Also how often is page Rank calculated?

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