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Last night all our indexed pages are gone from google. Completely deindexed - banned.

Links could not cause it, all of them are related, anchors diversified and spam is never used.

Content is the same like our other website has, just some small changes. First stronger website is working as usual.

So can it be that duplicate content caused a complete ban?

(Website is 6 months old. Content has never been properly indexed, due to same reasons i think. Last week we made changes, ant it started to get indexed quite well until tonight..)

yes it is shorter  - 100

We are making some linkbuilding.

And have very nice backlinks offer. So we are planning to put our 3 websites in it. Our 3 websites are on separate IP, but same C-block.

Can it be a red flag for google?

Can i put my 3 backlinks in one blog post?

For the domain, google will not penalize you at all. You might get a lot of value for the keyword in the domain. Just dont get penalities for bad linking between your websites etc.

You could get a lower CTR rate. and automatically google might lower you down in the results.

There are no more bad reasons not to use it. It should rank same like .org or any other. You just have to make  nice brazillian meta tags and visitors might click on your serp quite well. Also you need a good content.

At the bottom of index it will show "total products XX" and person can press on last page to check. So it should be related..

We are creating an online shop with thousands of products. And i want to put total product number in index title, each day/week it will increase.

This would be interesting for visitors to see. But would be it be good for SEO?

For example title: "Brand - Buy Toys Online, We Have More Than 10659".

I have good high DA PA websites hosted on same IP, added in same google analytics and GWT account. So i think google knows that owner is the same.

How should we link them with each other to get some value?

Put nofollow? With what anchor (Money keyword or domain name)? But whats the point? We cannot make natural link building profile with our own website nofollow links, i assume they will not count.

What can you suggest?

Maybe it is better not to link at all?

We have quite a lot of old content which is not visited anymore.

Should we remove it and have a lot of 410 errors which will be reported in GWT?

Or should we keep it and forget about it?

Can links indexed by google "link:" be bad?

Or this is like a good example shown by google. We are cleaning our links from Penguin and dont know what to do with these ones. Some of them does not look quality.

You could get a lower CTR rate. and automatically google might lower you down in the results.

There are no more bad reasons not to use it. It should rank same like .org or any other. You just have to make  nice brazillian meta tags and visitors might click on your serp quite well. Also you need a good content.