Catholic Churches are traditionally "oriented" (oriented="east") with the altar facing EAST toward the rising sun, which is symbolic of Our Lord's resurrection (which is also why we celebrate Mass on Sunday).
That's not what the poster said. He/she says CATHOLICS pray facing East. As a catholic, I never heard this, and certainly don't think it's dogma. I'm also a cathecist, and certainly don't teach this (that Catholics (must?) face East to pray). While churches may traditionally be built so the altar faces East, as you say, it isn't required. My church, built in 1955, has the altar to the North.
I guess I'm sort of reactive to statements on Free Republic that state Catholics do (like, worship Mary, Saints, etc) or Catholics don't (like read the Bible) and other such religious war nonsense.
If not so, I apologize to you, Mockingbyrd!