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Thanks for the help.
Now we only submit domains that are working sites. If you actually submitted a domain that redirects to another, I am not sure what would happen. The point to my long drawn out explanation is that as long as you do not submit the extra domain name or link from another site using the extra domain name, you will be ok.
Putting a link on another site using the extra domain would alert SE's to it existence, but not sure what would happen.
Do i need to set up another server with a meta redirect and exclude via robots.txt or can I exclude a subdomain from robots.txt already? If so, how?
You will need to set up another site, not server, where subdomain.example.com points to the directory with your ad. Then just put a new robots.txt in that directory that denies all bots.
Like aaronjf said though, if you don't link to the subdomain the bots won't find it.
BTW, if you use [something.example.com...] make sure you also have [[b][...] pointing to the same place. It's amazing how many people don't realise you can have sites without www and insist on typing it in (followed by emails and phone calls saying "your site doesn't work")...
Cheers
Stretch
I think I might make a special page for it specifically to go along with the messaging for the ad.
If I understood you right that can work well too. But keep it simple like www.widgets.com/green
Then on the page link out to the rest of the site so the customer is not trapped on that page, but don't link into it form the rest of the site so you could accurately track how well the ad is doing. Then put a meta NO INDEX, FOLLOW on the page so even if for some reason bots find it they will leave it out of the index. That would actually probably be a lot less hassle - and a little quicker - than purchasing and setting up a secondary domain that points to your primary just to track traffic. Not to metion it would save you a couple of bucks.
I don't want this url to get indexed or anything for the fear of possible duplicate content in Google
Use a 301 redirect from subdomain.widgets.com to www.widgets.com. Then Google won't ever index the subdomain, as it knows the proper location of the site.
I have a domain with .com .net .org and .co.uk tlds all pointing at the same website. I use a 301 redirect on all of them except .com back to the .com version, and Google now only has that version in its index.