Seems creating a technical blog is important for a developer, who to create one? On sitepoint?
Not sure what you are asking. Are you looking for ideas on what to blog about? Or are you looking for somewhere to host a blog?
some where to host my personal tech blog
The SitePoint forums are not a blog. But SitePoint has a blog and perhaps you could write for them http://www.sitepoint.com/write-for-us/