I think its all about comfort level really. Having a real money poker app through facebook seems a lot more familiar than going to online poker sites with their sponsored pros and huge guarantee tournaments etc. Especially since none of the bigger sites have really thrown their weight behind primetime advertising yet.
Once people start getting their feet wet at small stakes, the 'trickle up' process begins and away we go.....eventually
+1
I started playing because betfair offered poker software. It was an easier step to just play from there rather than starting on party.
So many people ask about poker in the real world. It is easy to see how many could play if there was an easy way for them to do so. I know people who have home games where they just play for a tenner and others who brag about winning at some free game online. There must be a huge number of potential customers in the uk alone.
And zynga must have so many people who already #lovethegame.
Only downside i can see is it is facebook.