If you are using an online CMS like weebly, xsitepro, webnode, or wordpress.com, and you have your own domain linked to it as well as the original subdomain site set up, will that hurt SEO because of duplicate content? Eg. mydomain.com is the same page as www.weebly.com/mydomain by using CNAME transfer, and both have the same content. Does it count as duplicate content?
Yes, it does count as duplicate content, but you may not be "punished" for it. You should be doing everything you can to make sure it doesn't become a problem. One way is to exclude www.weebly.com/mydomain from crawlers with a no follow meta tag and entry in robots.txt. Also, you need to go through whatever CMS you're using, and choose ONE location for a certain article or item, then block the rest of the references to it with robots.txt.
This is the 2nd time today I've mentioned robots.txt. I think i'm going to have to write an article about it. I've been using it for quite a while to clean up my duplicate content issues.
I can't alter these files using weebly systems, but I think I fixed it nonetheless. I made mydomain.com the default website, and www.weebly.com/mydomain now fully redirects to mydomain.com. Does this solve the issue? Thanks for the help