A blog is already a great tool for getting your content noticed on social networks, but you can increase your content popularity by doing some small tweaks to your Wordpress blog (aka Social Media Optimization).
The most important thing for having success in social media is writing great content, doesn’t matter how easy it is to spread your content on social networks if your content completely sucks, so before doing this changes to your blog think if they are really worth it. Would anyone submit your articles to social networks? If your answer to this question is no, start writing better articles or don’t even bother on doing these Wordpress modifications:

1.- Increase Linkability: this one is also the first rule of Social Media Optimization, what you will do here is try to make it easy for others to link to your article. Luckily Jim Westergren, created a plugin that lets you add a textbox to all your posts, which will include the html code for adding a link to your post. This is really great, because you are making the job of adding a link to someone using an html editor much easier.; the plugin is called Link to Me Textbox and is really easy to install, you can see a demo of it at the end of this post.

2.- Easy bookmarking: again this is other rule of Social Media Optimization, this one is a really important one as you will be adding buttons to make it easier to submit your content to social media sites. This can be easily done in many ways, the one I prefer is using the Sociable Plugin, which lets you choose which social network buttons you want to appear at your blog, you just have to pick the bigger social networks and the ones that are related to your blogging industry (for example for an internet marketing blog you can choose to add a Sphinn button). If you don’t know which ones to choose I would suggest adding: del.icio.us, Digg, Furl, Google, Netscape, Reddit, StumbleUpon, Technorati and YahooMyWeb.
Other way of doing this is by using the TopRank’s Social Bookmarking Tool.
An extra thing you could do is add bigger bookmarking buttons to your posts, I would really suggest this if there is a social network of your niche, you can see an example of this with the sphinn it button appearing in the upper right corner of all my posts. You would have to search on how to do this because it changes on each different social network.

3.- Title, description and tags on social networks: When someone is submitting your content to social networks they are usually asked the title, description and tags of the page they want to add, but if someone is submitting our content to Digg we would want them to write a catchy title and not a crappy one; we can point this out by showing them the title, description and tags they should use on our blog posts; you will be doing this using the custom fields function of Wordpress:
When writing a post, go to the end of the page until you see an option called custom fields, click on the + symbol and it will show 2 (or 3 if you have already got custom fields) fields called key and value, here we would have to add title as key and as value the title we would like them to use and do the same with the description and tags. To display it on our wordpress blog, you have to use the < ?php the_meta(); ?> function, the best you can do is add it just before the social media buttons we added previously.

4.- Reward incoming links: giving a small reward to the people that link to your blog, will encourage more people to link to your articles. The reward you can give is a temporary link, for example showing the latest 5 incoming links in your sitewide; this can be easily achieved using the who links here plugin (widget supported). You can see a demo of this plugin on the sidebar of this blog.

5.- PDF posts: just another SMO rule “helping your content travel”, offering your content in other formats is always something good as it will let people save the post in their preferred format and also submit it to relevant social media sites accepting that content’s format. To offer PDF versions of your posts you only have to install the post2pdf plugin, and you can also spread that pdf files by using for example iTunes.