Startup Idea: Startup Idea for Real-time Customer Trend Tracking at Retail Level

Startup idea to develop a software solution that enables retail stores to track real-time local customer trends by monitoring social media tags and possibly GPS data too. The intended benefit would be to help retailers become more proactive rather than reactive by providing faster and more locally relevant customer behavior insights.

I am a sales manager at a major retailer. It is hard to keep up with current trends and we consistently feel that we are being reactive instead of proactive. Software would help customers trends in a faster way and be able to help those customers in an impactful way.
An ideal situation would tracking social media tags at the store level. My company can track it at a corporate level but by the time it comes to the store level it is old data and does not impact at the local level. The stores could track their own customers, maybe by gps, that would help us react better.