is there any real benefit of using do follow or no follow other than keeping others from grabbing your stuff for a feed/posting on their blogs? Can someone please break it down simply, and especially why it's important to do (whichever) for your blogs, sites, etc? thanks
You shold use the no-follow tag to tell the spiders not to crawl a link. Google implemented this tag to combat spamers who abuse blog commenting. Dofollow is just not using no-follow tag.
Who you link to can harm your own reputation. Nofollow will preserve your reputation. Read up on nofollow here.
I think spammer will not stop try to filter it manually,...No-follow link is not useful to Google but not in other search engine like ask,aol etc.