Some other prior art: Splitwise: http://splitwise.com http://splitwise.com (I'm the CEO) Billmonk (acquired by Billpin) http://billpin.com http://billpin.com

Some other prior art: Splitwise: http://splitwise.com http://splitwise.com (I'm the CEO) Billmonk (acquired by Billpin) http://billpin.com http://billpin.com or see this Quora thread for tons more: https://www.quora.com/What-are-some-replacements-for-BillMonk-social-billing https://www.quora.com/What-are-some-replacements-for-BillMon... Jon