Add your 125x125p button code to your site so that other blog owners who want to share your blog on any other platform may do so just by copy-pasting the code in their sidebar or on any social networking site...
Here is a sample code for Technebula.Paste the code in your sidebar in the "Text or HTML "Widget and get an idea of what the share button looks like....
<a
href="http://technebula.wordpress.com/"><img alt="TechNebula"
width="125" src="http://lh4.ggpht.com/_TT65_wT8SDk/TFkgpT55CEI/AAAAAAAAAPU/W4-d39Lw2LE/Technebula.jpg " height="125"/>