I post content on my blogs about my hobbies - that includes trip reports on my amusement park trips. That includes photos and thoughts, and I'm a pretty logical person when writing so there's a lot of "logistical" details included in my commentary.
What apps/sites do I use and how do I use them?
1) I use an RSS reader (Feedly) to follow a variety of blogs and a handful of tumblr feeds. I use the app on my iPhone throughout the day and I'll follow up in the evening after work on my laptop.
2) YouTube - I never post videos, but I have a few daily searches to look for new videos, and I'll just click around on related videos from time to time. I've sent a few messages and I might have left one or two comments ever.
3) Facebook - I usually read and "like" posts that interest me. I rarely share things (website links, memes, photos) with others, unless I feel it's truly important for the "greater good". I post photos and details about more-interesting events in my life. I comment when I find the inspiration. I save a lot of links to read later, too.
4) I have Line for messaging. And I use it for that. I don't use any really public "social" features. Likewise, I use Skype for contacting far-off family.
5) I have a Twitter account that I basically never read and never post to. I'd be tempted if there was something seriously beneficial to using it, but I haven't reached that point yet.
It's probably more old-school than most people use, but I've always had a collection of daily bookmarks that I open up in the evening to cover some of my non-RSSable things like message boards, YouTube, and websites.
For the most part, I'm a lurker. I do like commenting and responding when I see fit, especially when it comes to the personal blogs and such. But "that's awesome!" just feels so ... standard. It's the text version of a "like" button (I do like "like" buttons, though). I like sharing my opinion.