You can add a 'share' feature at the bottom of your posts (simply google how to do this as it is really just a cut and paste job) on blogspot.com.
What's the power of this? There's no way to tell just how beneficial this feature can be for your site, unless of course you test it out. The share feature allows people to use any number of social networking sites (over 200 actually) to tell friends about what you've blogged about. This create a mediocre free link to your site which helps boost your rankings on google. What's more, your content gets passed via viral marketing to another person.
What's not to love?
I definately recommend getting a share feature for your blog!