why is paypal dropping after announcing the acquisition of pinterest? Not beneficial?

I would certainly look at what insiders, especially key executives, said to the media versus the status of their share holdings. For example, if the CEO continually to pitch the great potential or future of the company on one hand while consistently reducing his or her share ownership parallelly, i would definitely stay away from investing into this company. Not to mention whether the potential will be realized, the CEO’s ownership reduction action is a clear signal that the top gun does not believe in the future of the company.