And I don't own it and thus it is not spam. I think Facebook does. And I don't own facebook either
Anyways, we took a trip to Disneyworld a few months ago, and my daughter just had a fantastic time sending back instagram pictures to all her friends. It was star wars weekends so she got some great shots. She must have sent 100s. SO I guess you follow people so they would pop up on their phones and they could comment or like it, she you get as many as 50-70 likes on a good pic.
Really seem to be a great way to keep in touch with those back home. It is free, and looked pretty easy to use, so you might consider finding a 16 year old to tell you how to set it up. On the other hand if you left the 16 year old at home maybe not such a good idea.