2014-08-08, 18:11
As long as this is only for special occasions, there is no problem from our site. Please always put a backlink to Lightningmaps.org (map source) and "Blitzortung.org and participants" (data source). When showing it on Facebook, it's also a good idea to link to our Facebook page. 
Please note that you also have to respect the terms of Google Maps (we can not help you here).
Please note that you also have to respect the terms of Google Maps (we can not help you here).