I came here looking for the same answer.
After not finding an answer, I tried a few things. It seems like switching the order of the buttons may help. It’s worth a shot.
It’s too bad support doesn’t seem to be available for such a great plugin.
Good luck!
You can edit the width of each element (if you go to about line 750 of simple-social-expandable.php):
<div class="simplesocialexpandable sse-buttom-twitter"style="width:95px;"
If you change that width value for the relevant element you’ll see the space between the buttons change.
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I’ve had to roll-back to v 1.0.1 from 1.0.2 as the additional ‘Follow Us’ element was breaking the plugin and affecting other plugins as well, so the line numbers might be different in the .php file
