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how true is this ? how is google treating subdomains now days ?
My reasoning is because I believe I heard Dr Cutts talk about it sometime in the past, but also because I've seen multiple results from one site show up in SERPS on the same page when subdomains were used. Granted this site I am referencing was abusing subdomains. And they eventually got booted from G. But the point is G deemed them as different sites in their results.
Now by design, content from a subdomain should be considerably different than the content on the main domain, hence the reason for having a subdomain in the first place. So in theory you shouldn't see them both in the top 10 for the same query too often. Which was one of the red flags behind the site that shall remain unspoken that got the boot.
...it will also get the link juice from the main site
Assuming, of course, that there are links. There's no magic that spills over to a hostname just because the root domain is the same.
Subdomains figured heavily in some types of spam that Google needed to get a handle on - the total spam technique also used the fact that Google was indexing root pages very fast, even though the rest of a site would usually be sandboxed for quite a while. So the spammers said "How can I get tons of root pages? Use tons of hostnames (subdomains)."
Maximillianos is on the same track as I am here. A legitimate subdomain today often gets treated as something of a hybrid between a totally different domain and a part of the main domain. It's not 100% uniform - there are blogging platforms that offer each user a dedicated subdomain, for instance, and for those there's more of disconnect between the root domain and the user's subdomain.
So you're not likely to dominate an important SERP today by grabbing more than two positions via subdomains.
Cutts said that sub-domains and sub-directories would be traeated more equally by Google in the future.
They've been saying that now for a couple of years and I'm looking at a search result now where there is one listing from the root domain and two more listings from hostnames. So, I think the key phrase in the above is "in the future" because I surely don't see them treating them the same as sub-directories, not one bit. Hostnames rock! Always have and probably always will if set up properly to begin with.