Here is a short comparison of the advantages of spending your free time blogging vs. using Twitter (or “tweeting”):

Advantages to blogging:

1. You can post the content to your own website (if the blog is hosted there), helping to create more keyword-dense, optimized content for your site
2. Off-site blog content can be embedded with valuable backlinks leading back to your website
3. Leaves a more permanent, easily-accessible record of your writings
4. Easy for readers to pick up a “connecting thread” or theme among your various postings
5. Easy to have your writings indexed by other services like Digg or Technorati

Advantages to tweeting:

1. Your entire posting will likely get read, since it is limited to 140 characters
2. Followers immediately get access to your tweets on their own screens as soon as it is made
3. You are more likely to create more value-per-word, given the short posting size
4. You get to enter into a multi-person, continual “conversation” with others, which feels more alive and evolving than do one-way blog postings
5. You get access to other people’s “best stuff” for the reasons stated in #3 above

Both are excellent options, and a good SEO and/or community-building strategy could well include both. Happy posting!

Advantages to tweeting: