In white hat seo the link building is natural.Both white hat seo and organic seo is the same.In both cases link building is natural.
Please visit http://onlinesemmarketing.blogspot.com/2011/05/insight-to-organic-search-engine.html or http://www.squidoo.com/an-insight-to-organic-search-engine-optimization. Thanks.
article posting,social bookmarking,blog,forum,press release,classifieds etc., all are organic methods if you post for unpaid directory submission then that cooncerns organic.
link should come from natural way.... not by taking paid links.... and natural links are most welcomed by google....
In theory backlinks were meant to be created by OTHER webmasters (not you) as a kind of a reference or refferal. Some fall into a kind of gray area like article submissions and blog commenting which can easily be abused (article spam or blog spam), or be 100% legit. For example an article that's submitted that gets legitimately syndicated (not syndicated by you). Or a legitimate comment on a blog post and not getting software to blast out thousands of useless posts just for the backlinks. IMO
white hat strategy follows the googel rules to get rank. i take backlink from relevant sites and do follow blog comments, article marketing help to promote site.
White hat link building is building your links in a natural way...forum posting, blog commenting, article submission...etc.