Joe & Sally want to LiveJournal

If you're less interested in producing a weblog with tons of readers, but more interested in keeping a personal online journal that you share with a few far-flung friends, or if you want to join one of the largest online journal communities for a sort-of journal-as-large-and- slower-chatroom type of experience, then LiveJournal may very well be the blogging solution for you.
 
Although paid members can edit their templates, LiveJournal is for the most part a blogging space that focuses on the writing and the community aspects of the blogging experience. Since you're on a Mac, there are a variety of desktop clients for posting your entries to your LiveJournal, and one of the most popular comes in both Classic and OS X flavors: Phoenix. Check it out.