This post made me think of all the places I am. Wow, I wonder how unusual I am. Amazon sometimes to post product reviews. GoodReads and Audible. LinkedIn to occasionally post. BH Photo for camera reviews. Petapixel. YouTube for comments on videos. Strava for runs. Sometimes comments on The New York Times, sometimes read editor's picks comments there. Reddit and YouTube every day, sometimes commenting, sometimes uploading a video. I have a few boards on Pinterest. Medium for the occasional essay. Product Hunt now and then. Twitter and Facebook every other day or so. ADVrider daily. Flickr and SmugMug often. Instagram sometimes.
The only one I remember not going to anymore that I used to go to is Google+. Dunno quite why.
Tumblr never stuck with me.
Here's something awesome from Quora: