I used to have the Facebook and Buffer buttons in my date box (I've since removed them) - it's actually pretty easy to implement. You just need to add code to mainpage, single, category, and page.php. Look for this code in each file:
<div class="date_container">
<span class='day'><?php the_time('d') ?></span>
<span class='month'><?php the_time('M') ?></span>
<span class='year'><?php the_time('Y') ?></span>
<?php if($k_option['single']['acc_tw'] != '') { ?>
<div class="tweetmeme">
<!-- <script type="text/javascript">
tweetmeme_source = '<?php echo $k_option['single']['acc_tw']; ?>';
tweetmeme_url = '<?php echo get_permalink() ?>';
</script>
<script type="text/javascript" src="http://tweetmeme.com/i/scripts/button.js"></script> -->
<a href="http://twitter.com/share">" data-url="<?php the_permalink(); ?>" data-count="vertical" data-via="CollegeInfoGeek" data-related="thomasfrank09:Blog founder!">Tweet</a><script type="text/javascript" src="http://platform.twitter.com/widgets.js"></script>
</div>
<?php } ?>
<span class='date_container_bottom'></span>
</div><!-- end date -->
In that code, you can see that I've disabled TweetMeme and implemented the regular Twitter button (this is because TweetMeme is TERRIBLE at keeping accurate tweet counts). Just add the code for a like button or a +1 button there.