I also used to have a Lomo film camera which I would take everywhere. I really liked the film developing process, having to wait for the photos (digital cameras we already prevalent of course), then uploading them to Flickr, always also printing the photos, knowing that they would remain somewhere even if the website would be taken down some day. The Flickr account is still active, and from time to time I like to visit it, and each time I'm surprised that the website still exists and that their interface is still pleasent and relaxing to use, despite recent redesigns.
People dismissing these memories as nostalgia ignore the fact that smartphones had a profound impact on the way everything behaves. Instagram is not simply a "mobile Flickr", it's something profoundly different.