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So the best solution would be:

noindex,follow
and allow it in robots.txt!

Am i right?

And is it okay that my Wordpress SEO plugin puts rel=canonical on tag pages?
See example:
http://richclubgirl.com/tag/rich-fashion-2/

About half of tags are actually one-post tags!

So what could be the best practice? To no-index tag pages? Some of the tag pages have good page authority and they are linked well (with internal links). Cleaning up tags would be a very tough task, i suppose!

Or may be i should no-index only one-post tags?

I have duplicate content issue on my site, because i allow to index tags in my wordpress. And the content overlaps on them. What could be a solution to this?

How do i fight it, if still want my tag pages to be indexed in Google, but i don't want to to influence my traffic negatively?

Currently i have 596 tags!

Site:
richclubgirl.com

My idea was to put canonical tag for the post i want to rank from the most popular tag pages (with biggest page authority).

Would love to hear from You!

Now i see them, thanks! Will try to use this tool! Thanks for an advice!

Traffic from Google dropped in Apr 2012 and was decreasing all the time till Nov 2012.
In total it decreased 9 times. In November is started to grow. In October i moved to a new hosting with old domain to get rid of pharma hack! Pharma hack dissappeared. Links are present somewhere! Will try the tool!

GWT is set up, XML sitemap submitted, all posts indexed to this date.

Thank You for Your reply, Oleg! But all posts older 2012 are performing well in Google! I don't see sense. Is it possible to penalize newest posts only?

There was pharma hack before, but i've moved to a new domain. Links are left somewhere! How can i get rid of them?

I looked in Open Site Explorer but didn't find any links with viagra anchors! Where did you look?

I have a problem!

Sites like:
http://lynk.ly/
http://www.yousaytoo.com/
http://www.stumbleupon.com/
http://friendfeed.com/

Are replacing my posts even if i am searching for an exact title of the post.

For example this search query:
Christmas Party Style Sets With Black Cocktail Dresses

Original post here:
http://richclubgirl.com/christmas-party/christmas-party-style-sets-with-black-cocktail-dresses/

How do i fight this issue? I want to stay on these sites somehow!

Thanks in advance!

I have duplicate content issue on my site, because i allow to index tags in my wordpress. And the content overlaps on them. What could be a solution to this?

How do i fight it, if still want my tag pages to be indexed in Google, but i don't want to to influence my traffic negatively?

Currently i have 596 tags!

Site:
richclubgirl.com

My idea was to put canonical tag for the post i want to rank from the most popular tag pages (with biggest page authority).

Would love to hear from You!