hyem yes, I love clay.io they have everything Iv been waiting for :D
As far as my experience with clay.io they just finished writing there plugin about a week ago. But Iv been following there progress, and read over all the API documentation on there site which really helped me so far with it's implementation.
I just started testing it out though. I am in the proses of making a simple game right now to test out all of there social features with before I start a more serious project. So far so good :)
I'm glad this is what you were looking for. I would recommend reading over the API documentation on there site though. They have more in depth documentation on how to implement each feature with Construct 2.