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Check out [Zapier](http://zapier.com)

IFTTT does not offer webhooks, so I believe it is out of the running for this usecase

Both great services, but I'd need a greater level of customization to get it to work.

Would this be something enough people would use to justify it as a weekend project?

Maybe utility mill - http://utilitymill.com/ is what you need, if you're up for writing some Python code