.CA and .COM (Ensuring no Duplicate Content)

[EVERWORLD.ENTERTAIMENT]

Hello,

I know that this has been answered before. I have a website that has the same content for both
http://example.com and http://example.ca/

1. To Ensure I don't get penalized for duplicate content is there anything else I have to do besides adding the hreflang? Perhaps doing some stuff in the WMT? 
2. Where do I add the hreflang? In the header section of the homepage?

US site: http://example.com/" /> CA site: http://example.ca/" />

Thanks for you help?

[EVERWORLD.ENTERTAIMENT]

Thanks for the answer that help!

[SamuelScott]

I wouldn't worry too much about this.

1. Matt Cutts says in this video that what you describe is generally not a problem (because you're not being a spammer who is trying to game the system).

2. I'd review the international best SEO practices described here by Google. Google says you shouldn't worry too much about it, either. But I'd be sure to follow all of these guidelines -- geo-targeting settings for each domain in Webmaster Tools, for example -- in general to "tell" Google that you've got two different TLDs targeting two different countries.

3. Yes, hreflang is placed in the section.

So, having two sites with similar content at .com and.ca should be fine as long as you do what GWT says in the link above. Good luck! I hope everything's clear.