The ability to follow a buyer is a paid feature for MFG manufacturers. By following a buyer, the manufacturer may see both historical and current RFQs that the buyer has posted on MFG.
You can follow a buyer's profile by selecting the buyer's company profile and selecting Follow Buyer button. Upon following a buyer, they are added to your MFG contacts list. You will also get access to see both current and historical RFQs the buyer has posted on MFG.
A brief video of the feature can be found here.