I have published a new Question in LinkedIn:
Do you have an experience to work with Free Social-networking platform?
What are Pros and Cons for Free Social-networking platform?
The question is dedicated to on-line web service, which supposed to match-make 2 parties.
The project is in the very early stage and our target is to build a demo for the presenting the idea to investor.
One option which we were considering was to use Free Social-networking platform.
We got 16 answers, 10 of which I considered as Good ones.
Please find the answers here