Many bloggers will be looking out to promote or share their posts in Facebook or twitter.Using plugins will just slow down the site, So i have a code which will create facebook and twitter buttons to posts.

Step 1 using codes
function share_this($content){
if(!is_feed() && !is_home()) {
$content .= '<div>
<a href="http://twitter.com/share"
class="twitter-share-button"
data-count="horizontal">Tweet</a>
<script type="text/javascript"
src="http://platform.twitter.com/widgets.js"></script>
<div>
<iframe
src="http://www.facebook.com/plugins/like.php?href='.
urlencode(get_permalink($post->ID))
.'&layout=button_count&show_faces=false&width=200&action=like&colorscheme=light&height=21"
scrolling="no" frameborder="0" style="border:none;
overflow:hidden; width:200px; height:21px;"
allowTransparency="true"></iframe>
</div>
</div>';
}
return $content;
}
add_action('the_content', 'share_this');
Step 2 using a plugin
We can also add facebook and twitter or other social media icons through a plugin
Install the plugin below for wordpress, and ur done.
Click here for download this plugin.