If the grandparents enjoy getting physical mail and like hard copy photos to have around the house, then https://nanagram.co is a good option[1] You just text in your photos and they printed and shipped once a month. We use it for my mom to send baby photos and she loves it. [1] Full disclosure: my older brother built this service, but I don’t have an affiliation other than being a proud brother and happy customer. - Source: Hacker News / about 1 year ago

Nanagram- hard copies of photos sent on a monthly basis. Great for the scrapbooker family member. Source: about 1 year ago

I'm not affiliated, but I have been using Nanagram for the last couple of years to send prints to my Mom. Source: over 2 years ago

That is adorable. You know what she'd love? NanaGram. Send her back 3 photos of you for free on our home page. Source: almost 3 years ago

4. Grandparent gets envelope of printed photos just like the ones filling their old albums on the shelves It really is that easy. It’s affordable. And the founder is very responsive to any support inquiries. It was a service I always wanted to build myself but never had the time. I’m very grateful for it. [0] - https://nanagram.co/. - Source: Hacker News / about 3 years ago

Dubsmash is a viral video messaging app that lets its users create and share their rich media content. With Dubsmash, users can choose an audio recording or soundbite from movies, shows, music, and internet trends and record a video of themselves dubbing over that piece of audio. Source: about 3 years ago