People buying coins.
That is the most probable and obvious reason.
IS there ever any other reason. People always look for answers asking why, but there often times is no mysterious cause other than more people buying at a higher price.
I think it may be the google payment system implementing bitcoin, news
Bingo I think you might be right. It's annoying this got moved to speculation cause I wasn't wondering about the price move but the possible News that that be causing it.
There is no news of google integrating bitcoin. None that I could find.
That was just rumour based on baseless speculation. I doubt it's going to happen.