You can recommend your WordPress blog readers to follow your and your site on Twitter after they tweet your blog post.
WP Tweet Button is a free WordPress plugin. Using it you can show the official Tweet button on your site. Tweet button can be easily positioned as you like and you can give it your style from the settings page. Also it allows you to configure individual messages for your blog posts like you can use the title of the entry a default message for the tweets. It supports various URL shortners even it can help you to track effectiveness of campaigns using Google Analytics and the most beautiful feature is that it can suggest your tweeter to follow you and one more Twitter ID. Hence it promotes your Twitter ID at the same time.
Tweet Button in your blog post:
When someone clicks it:
Recommendations comes after the tweet is sent:
There are many other feature like it supports WPTouch, Counter can be set to vertical, horizontal or none, Supports all Tweet Button languages and much more. You can read about all its features on its page. Simply install and activate it and the configure its settings from Dashboard -> Settings -> WP Tweet Button