Add share tool to your fb, twitter, and G+ Account, with flyng fixed style
The CSS | TwentyTwelve theme

  1. Open  style.css and paste this code. Then Save

/** Post Share **/
.post-share {
width: 80px; padding: 10px 0px; padding-bottom: 0; background: #ffffff; border: 1px solid #CCC;
-webkit-border-radius: 8px;
-moz-border-radius: 8px;
border-radius: 8px;
text-align: center;
position: fixed;
top: 255px;
left: auto;
z-index: 15;
margin-left: -120px;
.share-widget {
margin-bottom: 10px;

2. Open Single.php, and search this code #primary in TwentyTwelve theme
paste this code right after

<div class="post-share">
<div class='twitter-share share-widget'>
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      <a href="" class="twitter-share-button" data-text='<?php the_title(); ?> ' data-count="vertical">Tweet</a><script type="text/javascript" src=""></script>
<div class='facebook-share share-widget'>
<iframe src=";href=<?php echo urlencode(get_permalink($post->ID)); ?>&amp;send=false&amp;layout=box_count&amp;width=450&amp;show_faces=false&amp;action=like&amp;colorscheme=light&amp;font&amp;height=90" scrolling="no" frameborder="0" style="border:none; overflow:hidden; width:50px; height:60px;" allowTransparency="true"></iframe>
<div class='google-share share-widget'>
<script type="text/javascript" src=""></script>
<g:plusone size="tall"></g:plusone>

see My PasteBin
Save, and see