Every business these days has an access to their Instagram, Facebook Business pages. If your objective is to communicate with other business portals or retailers, you have several ways to do so over the social media network:
1. Follow them/ add them
2. tag them
3. post on their timelines
4. Make appreciaton posts
5. Follow them to stay connected and have an update of their activities.
Your presence in their social media posts will help you register your business in the potential partner's and retailer's minds. Thus, help you build substantial relations with them.