A lot of outside the chain website PR in 10 days from 0 to 2 from where does PR come from?

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Since the April 2 GGPR update, site PR has a big change, webmaster are also pregnant with sadness, my several stations from this big update to get 1 to 3 PR, although this period of time PR is not stable, but there is a rise also prove that GG or more value these several sites.

This time I was surprised to find that I built a station for more than 10 days, did not do much outside the chain of the premise, PR unexpectedly from 0 jumped to 2, it is worth mentioning is that this station built station three days of Baidu, and received a lot of pages, and I several other stations do a lot of outside the chain, PR also just rose 1 to two, which has caused my concern and thinking , in the end this station's PR from where?

After I think and compare, I noticed that the station PR may come from the following aspects:

1. Domain name. I registered domain name is www.nokia-n81.com, domain name just registered, query Baidu chain number is 480, this and the domain name contains horizontal bar, but I think this is not true outside the chain, so the role is not, perhaps at all, there is no relationship;

2, I recalled, from the establishment of the station to the present, really done outside the chain of what? Just started to build the station, in my Sina blog posted a post, the text with my station link, in Baidu know and stick left over one or two links, in Baidu search hidden, QQ, every day on the net picked on the bookmark, but the number is not much;

3, with the Student Report network (the station PR update before PR for 0, now also only 1, do not believe you can check www.baogao123.com, ancient and old people and other small station exchange links, and two mobile phone station exchange links, because I am also a mobile phone station, so the link is basically similar links, this may have a great relationship, Because now GG PR algorithm seems to be updated, the content of unrelated links to the PR impact is not big;

4, the 4th do not know should not write, think about it, or write it. My site's program is Dede, this is the first time I built with Dede station, before listening to some predecessors said Dede to the engine is more friendly, included a large amount, so try it. May be the program on my site is indeed a collection of influence, but for the PR should not have a small impact.

I rookie one, the speech may have a lot of improper or wrong views, but also hope that you criticize correct!