At this time I am running technology related blog and I'm tired of it because of writing only tech related articles, because of this reason I want to make a blog on sub-domain of root domain where I'll share stuff that I like and mostly stuff that make me feel good. Its content is totally going to be different from root domain's. Is it secure to make another blog on sub-domain of my main blog or should I buy new domain name. Thing is, I want to stick with my old domain name.
I am going to make a sub-domain like this fun.domain.com
I read somewhere that Google treat sub-domains as spam. Because it could be used to takeover search results by making too much subdomains e.g. About.com have different sub-domains for different categories but Google don't take it as spam.
Update: Thanks for letting me know about another question about this topic. Do subdomain help/hurt SEO. It answered my question but I want to know little more if anyone can help.