Here is what I reckon -
Bitcoin - Yahoo -> biggest in the early days but superceeded by better technology and will gradually fade
Ethereum - Amazon (Maybe) -> Early with a lot of adoption and some good fundamentals
Lisk - Geocities -> Every javascript dev can now have their own sidechain
Steemit - theglobe.com - Hey I've got a social network
Ripple - Commerce One - will it also reach the 21 billion valuation before people realise it doesn't really do very much
Dogecoin - pets.com -> Feed the dog!
Dash - Flooz.com
I don't see the real Google or Facebook equivalent winners just yet - Maybe it will take another iteration of technology.
