Can you do this in Instagram? Put notes on top of other people’s photos? No. You cannot do that in Instagram. But you can do it in Flickr. There’s many different ways you can ask your fans to leave notes.
Take a skyline photo and make the buildings talk. It’s fun to personify architecture.
With a plate of cookies, ask people which is their favorite.
Photograph a crowd of people and make each person say funny things.
Need more convincing why flickr is better than instagram? Try:
Why Flickr is better than Instagram: Reason 1 (search within your favorites)