Hi there,
My name is Ardiane, a Guru here at Shopify!
At the moment, there's no integration available between Shopify and Factual. I've had a quick look at what Factual does and it seems that from my understanding, it improves mobile browsing and provides location based context solutions within mobile, web, and server environments.
I just wanted to let you know that all of our Shopify themes from the App Store are fully responsive and work on mobile and tablet devices so that shouldn't be a problem for your online store! As for Factual locating the users' locations and displaying content based on their location, I'd love to hear what you'd like to use this feature for so that I can perhaps give you alternative solutions for it!
- Ardiane :)