I have tried to do your assignment to the best of my ability. I couldnt deliver as early as i should because i had little health challenge. But i guess I'm better now.
I will answer according to the numbers. No need repeatig the questions.
1.@lucylin initiated communication with opidia 3 times

1. Opidia posted 81 times
2. Opidia made 898 comments in all
3. Opidia initiated communication 2 times with lucylin
4. Megadrive initiated communication directly with lucylin 1 time.
   Thanks and i hope this helps you