EBrandValue (YC W15) shows social media’s impact on your sales in real time

As someone who works in marketing for a complex SaaS product, one of the biggest questions I have for anyone claiming they can tie a dollar amount to to a specific channel (in this case social) is how they deal with a longer conversion path (ours on average right now is around 4-5 months). With everyone from the sales team to our PR to the web designers to the marketing automation folks all claiming they touched the customer journey at some point in a meaningful way, how does a product like this actually attribute credit correctly? All the attribution modeling in the world is so dependent on countless factors, really hard to drill this down, but if they're capable, then I can't wait to try their product.