Blogging and/or having a website that you update regularly is great:
I use Blogger. Many serious food bloggers use WordPress. WordPress gives you more tools for doing cool stuff, but it also requires way more care and feeding.
At this point, most of my energy goes into offline stuff.
I started as a blogger, at http://FeedMeLikeYouMeanIt.com/ .
I have run lots of events, and will do more: http://FeedMeLikeYouMeanIt.com/events .
Two and a half years ago, my book was published: Real Food Fermentation.
(If you have questions, please ask!)