Allow your readers to say thank you for your posts. You can add a ‘Thank You’ button to each of your post/page, counts and shows a total number of visitors ‘thanks’ (i.e. thank you counter) for post/page.
Author box plugins expands user profile page by adding social media fields and makes it easier for readers to follow author on social media networks. Here is a list of top 5 WordPress plugins for displaying Author Box after posts, pages, widget areas etc wherever you like. If you only want to add a perfect cool author box after your posts then try Fancier Author Box by ThematoSoup or read this tutorial for knowing about more plugins providing different types of customization.
You can display your Facebook page feed in your WordPress site, just like you display your tweets.