Using subdomains for autoblogs

What's up everyone, it's been a while since I last posted something. Well I'm starting to get into autoblogs, I was wondering if subdomains are still a good way to add different blogs without spending a lot of money on registering individual domains? The reason I ask this is because I keep seeing how you know who updated their algorithms and how autoblogs are just dropping like flies. I really don't understand what is the big deal, I keep seeing spam sites and autoblogs.

So would using subdomains be a big red flag?

Rank for urls or pages, not for domains or subdomains. IF Google does not catch your use of automated content, and you have picked multiple good keywords with low competition, you'll rank for several pages of the subdomain. Otherwise, it's best to not rely on SEO to rank an autoblog on a subdomain, but to use other non-ranking methods that bring lots of targeted traffic (social media, Yahoo answers, video, et al) to promote the site.

What do you mean "rank for urls or pages"?

I think that he means that Google ranks posts/pages but not websites, therefor the location of the post/page is not so important as the relevance of the content.
So good content should rank regardless of its location, perhaps not absolutely true but still a good benchmark.

i think it's not a matter subdomain or individual domain but it's a matter u build autoblog or legitimate blog, that's the matter google cares... unique readable content and not...

Ok thanks for the replies