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installed the tweetbutton module and configured it for 2 out of 10 content types on the admin config page but noticed the button was showing on all content types. Made a small change to line 83 in the tweetbutton.module to make the in_array function call strict:
if (in_array($node->type, variable_get('tweetbutton_node_types', array('article')), TRUE)
it was so minor that I didn't create a patch but can if needed.