Twitter has taken a different view and has restricted political ads on its platform entirely.

http://epicentro.instructure.com/eportfolios/1932/D_Bol_Age_Limit__Magnum_Pharmaceuticals__Oral_Steroids
http://people.instructure.com/eportfolios/110621/TestovironE_300_Mg_Lab__German_Remedies__Injectable_Steroids

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What pages and products have they looked at on your website.