Social Bookmark Icons

So I have added several links to social networking bookmarking sites to each of the pages within the theme..  I really wasn’t sure which ones most folks used so I went with the 4 that I knew the most.. I’m sure I’d be better served by adding twitter, google and others.. but really I’m not sure which ones most folks use.

I had thought of using an addthis.com bookmark button but I don’t know that I want their button on my site.. it’s kind of ugly plus I don’t know that I want to link to them.  I think they do popup ads and I’m not really keen on that..

If more networks are required I’ll likely create my own button system to house them all..