Yes, all of this. I can, and have, met people by commenting on fic, but it's not my perfered way of meeting people on the internet. Combine the social anxiety of meeting people with the anxiety of leaving "good enough" comments on fic and it's just a big disaster.

And sometimes I don't have enough thoughts on a fic to start a dialogue. Often "I liked it" is the extent of my thoughts on the fic.