See the video linked here for full details of this job:
We have tied to add social networking buttons on the blog roll of a WordPress blog (e.g. All posts on the front page of the blog have a set of Facebook, Twitter and Linkedin buttons) . However doing this increases the loading time of the pages significantly. We have noticed that TechCrunch.com also does this ( has social buttons on the front page blog roll article snippets) but has somehow resolved this issue, possibly with deferred loading of these scripts. I have noticed that they show an image of the buttons before the buttons are in fact loaded.