GMO Go to Top is simple plugin and it will add a simple button which allows users to easily scroll back to the top of the page.
Creates "top" link on your web so that visitors could simply get back to the top of your site.
Creates animated Go Top/Go Down buttons in the right bottom corner of your blog. After click, scrolls to top or bottom of the page.
This plugin will enable top page button and facebook likebox in your wp site. You can change color and other important settings from Option Panel.