It’s impossible to delete your Pronto.com account. Same goes for associated sites ProntoStyle.com, ProntoHome.com, ProntoTech.com, ProntoKids.com, and BabyPronto.com, so be careful what kind of info you share on these sites.
Be sure to complain here: http://www.pronto.com/help/about/contactUsForm.do – and politely ask for account removal as well.
URLS:
http://pronto.com