Sharedaddy is an excellent social sharing plugin included within the plugin modules of Jetpack.
To use the entire Jetpack plugin, you’ll need to connect to a WordPress.com account.
If you don’t want to connect to WordPress.com, you can also use some of the individual plugin modules within Jetpack independantly.
Once you’ve chosen the buttons you want to display, they will be displayed at the bottom of your posts.
You can also add more sharing buttons to Sharedaddy which aren’t included by default.
To display them at the top of all your posts, simply add this code to your child theme’s functions.php file.
They’ll then be displayed above and below all your posts and pages depending on the configuration of your settings.
It’s be proven time and time again that content above the fold gets far more attention from readers.
You would have to think that displaying your sharing buttons before your content will also improve the amount of shares you get as well.