I need a Pledge Widget

Hello WordPress experts and users.

I dare say I’m a Joomla convert, so I’m a bit lost.

What I need for our non-profit site is a tool or plug-in that allows users to make a pledge that can be counted on the site and shared socially. I found a few sites that could do this, but I’d like to see traffic come from local sources. It’s a buy local campaign, and we don’t need a pledge tool that accepts cash either. It’s more of a just for fun sort of deal. ibuywarren.com is the site. Sort of a directory of local non-chain businesses in Warren county, VA.

Anyone have any ideas on what we could use? I’ve searched for a couple of days now.

Thanks in advance for any leads.