Reddit is quite popular, though many people don't connect with it. It has a devoted user base that is often less friendly to outsiders. I think this is part of the appeal for people that do use it. Here is something that I think is accessible for others. The AMA's (Ask me Anything) can be really interesting. Matt Damon has some really interesting answers that go beyond stand surface-level answers. The comments based on his answers are part of the fun of reading it. For anyone who checked out Reddit and didn't care for it, I think this a good for giving a taste of what reddit can be.

I was always curious about how Snapchat's filters are able to identify human faces so well. This video gives a simple explanation of how it works.

Pinterest usage statistics. I knew this before using it, so I was a little hesitant. It didn't immediately "click" with me. After trying it out again, I have found it much more interesting. I added my wife as an editor to the board and it has proved to be a good way to share information about a topic of mutual interest.

I have a friend who works in advertising. He uses Pinterest when doing research for ad campaigns. I think this is a good example of someone "working in a visual medium" as Dr. Dennen suggested.