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There might be another problem in the given case. Your domain might have been banned by google. Insert in google site:mysite.com - do you see any results?

Paulo, be more concrete. What exact changes did you make? How much time ran after the changes? Did you change the back link profile?

There are some potential ways to solve this situation.

1.Close indexation of duplicate urls in robots.txt

2.Set up derictive in GWT delete urls from index with parameters that identify duplicate content. Mike wrote the examples of parameters before.

Important to evaluate the trend whether the amount of errors in html improvement section in GWT. If it grows you should use some additional steps not only canonical urls.

What do you mean writing 'mysite.com pointing to x.mysite.com' ? But describe current content of mysite.com and when placing new products to mysite.com will be current back links relevant to new products?

Relevancy and authority of the site and the very page that links back to you is much more important  then the anchor of the link in present SEO process. But you need to remember that quality sources place no-follow tag on outbound link. So, check if the links are do-follow. Do-follow link from relevant page of trusted web site will help in any case not depending from the anchor text. Big concentration on making links with keywords as anchors can lead to getting Google penalty.

You don't have the proper understanding of the case. Google updated PR in December and the previous update was in February. If you didn't update the content and didn't get powerful backlinks and lost few old backlinks it is a norm that for the period of PR update your PR wasn't big as you expected. But again I don't see any problem in the missing PR if your traffic and sales grow.

First what you need to control is anchor texts. If the tool you use uses one commercial keyword as anchor text for all sites it is a big problem for your link profile potentially.  For a start check your backlink profile and see the anchors (use MajesticSEO or Ahrefs for this). For natural profile most used anchors will be brand names, url as anchor or domain name as anchor.

Exact those links will not hurt your site. But most important problem with all affiliate sites is unique content. Often they copy paste advertising materials and not provide any additional value. For making content of your sites more unique you can try develop another types of content not just text. For example you can develop video reviews of hostings, infographic with info about hosting, ebook with recommendations on selecting hosting etc.

Please provide the url of the site. We will try to help. Is your site deindexed (when you insert in google site:yourdomain.com - what do you see?) or can't find site in top 100 results for any keyword?

It is hard to say without the exact site. Those can be short jumps or you just got overoptimization filter from Google. In addition to the questions from other users tell me please current percentage of keyword density for your targeted keywords. You can check this easily with SEO Quake Toolbar.

Yes, this is duplicate content. Try avoid this situations, this is not a big deal to rewrite the content in other words. It is hard to predict whether your case will harm the sites but if possible don't do this in future.

For your case I recommend two possible solutions. The first one: write unique descriptions of your products. The second one: set up canonical urls from one domain on another, for example from uk domain to us domain. It will be the sign for Google that content on uk domain is duplicate and original on us domain. Of course your uk domain will not rank well, but you will avoid duplicated content problems. As you see much better solution will be just write unique content. And it will give you more freedom for domain targeting and will be much more smarter solution.

Yes, if you can quickly write unique meta descriptions you can start doing that immediately and if the site is not big and you manage to finish it in 1- 2 weeks there is no use to delete meta descriptions. If you see that this will occupy more then 2 weeks it is better to delete duplicated metadescriptions. But the best solution will be to write unique meta description immediately for home page and other important pages which rank right now.

There are some great tools:

onpage optimization analysis - SEOquake toolbar

backlink analysis - Ahrefs or Majestic SEO

market cituation - SEMrush

You need to develop one type of site name structure for your case. Shortened variants will be suitable for small count of cities. And if you pland expanding your presence over other cities ther emight appear a problem creating shortened urls. About SEO, branding or recognition of site - there is no use to speak about those without understanding your market exactly.

Up to me your exact case demands one single site. There is no use to write the same content on two sites. It is better to use one .com site with possibility to chose two currencies. But you can buy uk domain too and have a possibility for future development of something personalised for Uk market but remember to post there only unique content.

if we talk about a domain by itself it is not a privilage to have an old one. Your domain is listed in dmoz and yahoo directories and has more other backlinks. And those backlinks are more valuable then the exact age.

To make the first answer full you must understand that if your site will not load quickly and correctly it will harm on behaviour factors which you can see in Google Analytics. Users will close your site faster and come back searching for other content to read. And this can be a sign for Google that your site is a low quality one.

It much more depends form the quality of the site you get the site wide link. If this comes for example from Yahoo or Amazon or another trusted site it will never harm your site. But if you receive the same type of links from low quality sites it can be a big problem for quality of your site back link profile.

Not exactly. In a nutshell - no. But sometimes if your PR is 5 and higher it is a good sign that your site has good content and good back links from trusted sites. This is what donates to your reputation (irony)). But there is no direct connection with ranking and quantity of traffic to the site.