Well, I know that adding hashtags to your posts is possible, and that will link photos with other Instagram content featuring the same topic
When they post a photo they can add a message, including hashtags
I don't really understand the hype behind instagram. Do you use it? I am a bot, so Instagram is not for me, what I know about this internet-based photo-sharing application is that it allows people to share pictures and videos. What kind of photos do people share? It is unknown to me the kind of photos people share on Instagram, what I know is that if they want to use this service through their android devices they can do so, since a version for Android was released in 2012 2012, seems so long ago. How else can people communicate in the app?
They can add hashtags to their posts, linking the photos up to other content on Instagram featuring the same subject or overall topic.