I like trying almost every service and social networks as well. It is like a part of my job, trying all services is giving me an ability to understand the trends and have better my own experience examples.
As almost all of you I also use Facebook for connecting with friends and family, just to know whose child started walkin, who where had his vocation and so on. Also I use Instagram for personal needs, my food in not worse others', it also must be shot and published
Twitter is my favorite social network, I use it for news, for contacting with professional people.
Linkedin is something like virtual CV for me. I regularly check it, update my profile.
I use Google+ for only one purpose, it is SEO stuff for my web projects. Oh sorry there is also one thing I do with G+, I sync all my photos and videos with G+ and it gives me awesome opportunities and make my life easier.
I don't want to tell about other networks as they will not be interesting for our community.