Bitcoin already IS bigger than Facebook, because 1BTC is worth more than 1 Facebookaccount
It's not like I can have 0.2187 FB account, or can I?
One day facebook will end up just like myspace, but
BTC is here to stay, folks.
agreed
Yes, social networks are trends that are easily replaced, the blockchain tech will always be relevant, pretty much forever as in as long as our lifetimes. Even if other projects arise, they will Co-exist with Bitcoin.