SXTZ said:
Blogspot on the other hand is more for those who do want to keep a blog
and want to be semi-"discreet" about it, not really wanting to trumpet
their writings. Which sort of goes against the whole blog thing but
what the hey.
I guess it depends why you want to keep a blog. If you're looking primarily to save a log of websites, with your comments about them (which is what the earliest blogs were), then blogspot might suit you. Equally, if you want to keep an online diary (which many are using blogging tools for), then LiveJournal, which lets you set quite a lot of restrictions about who can see what post, then that might suit you.
If, however, you want as many people as possible to read your blog, as well as the platform (Blogspot & WordPress.com are pretty good for lots of traffic), you need to ensure that you publicise your RSS feed, post comments on other's blogs, post your URL to as many different blogging aggregators as possible etc., etc,.
It all depends on what you motivations for keeping a blog are.