East Bay to me is Pleasanton, Dublin, Milpitas, Fremont, Hayward...I count Oakland and Berkeley separately.
I can't think of the last time I was up in Oak/Berk and it wasn't to go to Yoshi's or visit a friend at UCB.
And to whoever talks shit about Oakland, go take a look at Lake Meritt.
I knew you were from Peninsula or at least thought from SF, because I think you've mentioned it in the past.
You can gauge how "South Bay" it is where you are by the density of pho spots and Viet coffee houses (specifically, how late those coffee houses stay open).
I love and hate the Bay Area at the same time. I want to live abroad or at least in NY first, then abroad, but every time I go overseas or out of state and come back, I think: "Those poor fucks don't have what we have: food, weather, roads, proximity of snow/beach."