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I just created a subdomain to help our main TLD website. I was wondering if it's smart to create a separate TLD for this subdomain and set up a forward and build links to it. Reason I was thinking about it because it would be easier for people to remember instead of typing in subdomain.maindomain.com. But, I don't want the main website to suffer, since the purpose of creating this subdomain and it's content is to help the main domain. Any inputs on this? Thank you.

Our site is new. So far we have a 534 pages. Our competitors have around 5000. I'm working on building more, but that's a lot of catching up. The report says we have only 174 internal followed links. Why is that? I have all links set in the site to be nofollow links, but not the inside links. I also have lots of landing pages, which are not added to the main menu, obviously. But the the main menu shows up on all landing pages. Just wondering if either the nofollow has anything to do with it  or the landing pages set up, or the numbers are accurate. Any ideas? Thanks!