What Are The Best Wordpress Plugins For 2011

Hello everyone here,

I am new to this forum and was hoping to get a little bit of help with my new blog as it has been a short while since I set one up.

I have created a new blog at http://www.Livinginginsydneyandnsw.com and added a few plugins but was hoping to get a list of recommended plugins that will help SEO and traffic.

I am particularly keen to hear what the best plugins are for social media sites and particularly Facebook comments?

Any help would be much appreciated!

Thanks,

Kevin