This is a money grab,and a money grab only. Yes it may bring some more customers to Coinbase, and other exchanges who are advertising on Facebook. But these people -- in my view -- were going to find Bitcoin at some point anyway. As the only way these people are being targeted on Facebook is related to their interests, so this is going to be people who were most likely going to find out about Bitcoin at some point. I also think that this may have an effect on the Bitcoin price -- but it won't change anything relating to adoption (which is what we should really be focusing on, as price means nothing if no one is going to accept bitcoin)