Your point of view is very interesting and fully agree that a universal model will be the best solution for D8-Social Networks!
But one important thing I want to say you is: Try to finish Dolphin 8 before Google opens Google+ for everyone, because all these guys out there would already be so bugged after their shift from Facebook to Google+, that they won't switch to a third social network.
You are doing a very good job!
Keep it up!

P.S. (Yes, I still use these P.S.s even with our computer see more technology ;-) ): Don't be cross with me. I'm sorry about my bad English.