Whether or not zynga's rng is 'true' it's definitely not rigged for any particular players (if they rig for players who pay more, this will mean those players don't pay anymore as they aren't losing think about it and if they rig it the other way around all the better for the free grinder)
There is an actual secret game mode that you cannot physically play on the computer/facebook version of zynga: jump tables (zoom poker equivalent)
It is literally the secret to profiting at a ridiculously consistent rate.
You will be up against thrill-seeking fish who are half chatting to a friend and tapping on their phone... On top of that it's the single fastest way to overcome the obstacle of not having multi tabling capacity (zoom tables allow more hands per minute etc etc)
You literally will not find a better way to grind.
If you don't own a smartphone or tablet than sorry for you.
You won't consistently get to rank 18+ using this method as the stakes are too limited for that unless you grind 24/7 but you can consistently grind out a rank 17 placing each week if you are a dedicated player.
No, they are there perhaps to interact with already-made friends who you socialize with outside of their platform but if you actually make and keep friends through facebook and zynga you will end up a very lonely human being.
