If you are looking for a way to post to multiple social networks at the same time, you can use a free service called HootSuite. HootSuite supports all of the major networks such as Twitter, Facebook, Google+, and many more. It handles multiple accounts and can even post to your WordPress blog.
You don’t need a bulky third party plugin in order to create an interactive Twitter widget for your WordPress site. Twitter’s 1.1 API offers Embedded Timelines which allow your visitors to reply and Retweet directly from your website.