it might honestly just be shitty people on your friend list.

i personally enjoy plurk a lot and use it as my main social platform but i have a very small plurklist and it's comprised of people i do consider actual friends. i do non-rp things with a lot of them, but i also thread with them or chatter about our own cr consistently.

it's harder to do this when you have 50000 people added and are spreading yourself thin trying to make vague connections with anyone.