The friction of sharing and reacting to life milestones with all your friends and family is an order of magnitude easier on Facebook. For example, try teaching a grandparent or technology inept uncle how to see photos of grandkids/nieces/nephews through email vs checking Facebook...
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My kids grandparents are more appreciative of a photo in a frame or a drawing on the fridge than an image on a screen. Of course they can pick and choose if I chose to post those photos on Facebook, but I also take pleasure in curating and actually spending money to create a print (if I spend money on something, I'm more likely to do a good job.)
What makes you think they are mutually exclusive ?
Because I doubt your grandparents are going to be having hundreds and hundreds of photo frames of your kids.