After enabling Yahoo Placemaker and adding an API key in admin/settings/site-information I got this error:

An error occurred. /batch?id=5&op=do <br /> <b>Fatal error</b>: Call to undefined function curl_init() in <b>/home/planetdrupal/public_html/profiles/managingnews/modules/contrib/extractor/libraries/placemaker.inc</b>  on line <b>28</b><br />

Installing php5-curl fixes the problem but perhaps it would be good to list this requirement on the project page or even check to see if the function exists before bombing.