The only social media I have is Facebook but mostly for the apps and games. I don't have the luxury of being able to play Candy Crush or Bejeweled on my mobile phone! But I do have concerns about their security. I know they changed it sometime earlier of the calendar year and I'm the type of person that is paranoid about social media security. I have a Twitter but never use it. I can't express my thoughts in 140 characters or less for me. It's just not possible. And Tumblr is too discombobulated with pictures everywhere and Instagram, well, I don't need to take pictures of everything that happens in my life. Too much!
To me, every top notch product goes through phases where it's on the top but then, when competition emerges, the top king is knocked off and another takes another. Music is a perfect example of how quickly things can go from obscurity and being unknown to famous and getting recognition. No one ever heard of Harlem Shake, Macklemore, Robin Thicke or Lorde two-three years ago but they are top trends in music in 2013. (At least not me!)
Other than that, I just think everyone loves anything that's new or in the now so to speak and that holds true to practically everything. New phones, new music, new social media. Pretty soon in 2015, some other social media site will emerge out of nowhere.