One easy fix to your social media posts and in-store signage can help increase your following online, and that is to just tell people why they should follow you. Is it to receive special deals? Be the first to know about new product arrivals? To receive invitations to in-store events? Receive exclusive offers only available on your Facebook page/Twitter profile/Pinterest page/etc.? Or to learn new interior design tips/beauty trends/cooking tips/recipes/bike maintenance/local info/etc.?
Tell people the why versus just saying "Follow Us on Facebook!"