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I think the more your old site is the more authority your site got

subbmit this backlink to google by google webmaster

2 PR 9
joomla(.)org
simplemachines(.)org

That mean you buy backlink or spam backlink from 1 site

yes it get you more traffice but now aday blog comment not make any effect more

You can using google mastertool to check you site advoid google penguin 3.0 ?

you can using google webmaster tool to check that

Alway backlink and social posting

I think no one know about google next update

Use ALT tags to optimize image

link exchange, specialy the same business, It help you site rank more and more but not banned by google

it depend on your strategy. If it short term i prefer ad and sort term using seo

i don't think no happen with what you do for you site

yuh, my site increase PR after Penguin 3.0

Yes. It help your site good than befor so you can get more customer

Seo include onpage and offpage. Onpage: U using you create your content, h1,h2 tag. Meta title, Meta decription..
Offpage: create your backlink and get more traffice