Ad 3

Source: GOOD Magazine
Target Audience: Most people (probably geared more towards younger people, as Toms have become more of a trendy fashion statement as of late)
Product: Toms shoes
Target Audience A has assumptions that wearing toms makes them a better person, because voting and giving blood are associated in the same category of 'civil duties' and 'being a good person' all around. (ie if you vote and give blood, you automatically should wear Toms because doing good should come naturally to you.) The consumer should want to do good, since Toms donates a pair of shoes to someone in need every time you buy them. (Guilts people into buying)
Buying these shoes can make you feel fulfilled and like you have made a difference in someone's life who may be in need or who doesn't have shoes.

http://www.google.com/imgres?q=shoes+magazine+ads&hl=en&biw=1024&bih=578&tbm=isch&tbnid=1lvHJxutTjVF5M:&imgrefurl=http://www.tomsshoesblog.com/http:/www.tomsshoesblog.com/good&docid=MBl2u-18Pi2U8M&w=2628&h=3378&ei=ubWJTvnHOeff0QGyj5XaDw&zoom=1&iact=hc&vpx=244&vpy=169&dur=868&hovh=255&hovw=198&tx=122&ty=102&page=2&tbnh=172&tbnw=134&start=20&ndsp=8&ved=1t:429,r:5,s:20