Lets make this simple. There are lots of things IFTTT can do. But the most usable is sending your instagram photos to twitter. Start there and then you will realize how awesome this service is.
When you post an Instagram to twitter it only includes the link to the Instagram post. But twitter has a solid native photo integration. So use this recipe and it will automagically send that photo over to twitter. (It might take a couple minutes.)
I also use this service all the time to save photos that are used with a #hashtag that I’m promoting. In 2014 with the PennDel Youth we used the hashtag #in14. We then set up IFTTT rules to save any Instgram photos to Dropbox. We could then do whatever we wanted with the photos.
Explore the website it can do amazing things.