social-sharing-alignment.html

<div class="social">
	<span class="twitter">
		<a href="http://twitter.com/share" class="twitter-share-button" data-url="[your-url-here]">Tweet</a>
	</span>
	<span class="google">
		<g:plusone size="medium" href="[your-url-here]"></g:plusone>
	</span>
	<span class="Facebook">
		<iframe src="https://www.facebook.com/plugins/like.php?href=[your-url-here]&amp;show_faces=false&amp;layout=button_count" scrolling="no" frameborder="0" style="height: 21px; width: 100px" allowTransparency="true"></iframe>
	</span>
</div>

social-sharing-allignment.css

/* This gets Google to fall into place */
.social {
	font-size: 1px;
}

/* This gets Facebook to fall into place */
.social iframe {
	vertical-align: middle;
}

/* Set an optional width for your button wrappers */
.social span {
	display: inline-block;
	width: 110px;
}

/* Adjust the widths individually if you like */
.social .google {
	width: 75px;
}