Recently while working on my personal project, I did start looking for a nice interfaces to share the links on the social medias, Facebook, Twitter, MySpace etc. Doing so, I came to know five different ways to do that, and hence this experience I would like to share with you and my take on it.
Here are my picks..
1) CNN:

What I love about CNN Interface is it is less clutter and it highlights on mouse-over, though it don’t offer any other Social Media integration like MySpace etc. however the simplicity really the best way to get the thing done quickly.
2) Lifehacker (any Gawker Media Blogs)

Again the simple clean version, what I don’t like the placement of the links to share, reason is when I am done reading the article, then at that time I should be able to share it, because as a reader I am good judge of “should I share it with my friends on Social Media or not”. The best thing I like in this interface though the name of the Author is vivid as compare to the CNN.
3) NYTimes

The minimalist icons and putting few Social Media icon upfront and rest under the “Share” menu is good idea. Though the presentation of that small pop-up is not so really vivid, and visually confusing for the user. It should present the icons of other Social Medias on the different background rather than the White one, to keep it more clear about the choices.
4) Rotten Tomatoes

Using the third-party service and their interface is really a quick way to putting the Share-a-link feature, however I think it does create some redundancy and create a big “What’s the difference between this and that?” question in User’s mind. As we can see in Rotten Tomatoes’ example they put the Facebook and Twitter link upfront like NY Times. However the plethora of options I can see when I click on the “Share” button conveniently from “AddThis” making user experience little more than messy.
5) Mashable

My personal favorite is Mashable, It is “organic”. Drag and Drop is in User’s nature and utilizing it in an innovative way as Mashable does, it really makes a difference. Presenting only the popular social medias to share the link on to them is the best way to keep the User Experience simple and fluid, with the touch of innovative drag-and-drop feature.
At the end my suggestion is you only need to apply the best suitable interface for that matter according to your site content. However if you are using the third-party tool like “AddThis” then be aware of the duplicity to avoid the confusing for your users.