Out of all the Facebook, King.com, & other social/casual web games I've seen my family play, 100% of them have been Flash. I think in years past some have been Java, but I've not yet seen a HTML5 game in use on the big sites as played here.
Since my family doesn't pay money into these games, their style involves playing broad coverage of games: They play each for a little bit until the life meter runs out, and often try new games. Again, 100% have been flash.
There are also tools & frameworks like Starling for converting either AS3 code, Flash assets, or full SWF files to other non-Flash platforms. For instance, I wrote the sorting algorithm in as3isolib, and noticed that Ubisoft ported one of their games using it to iOS, using Starling.
Flash is certainly alive and well.
Since my family doesn't pay money into these games, their style involves playing broad coverage of games: They play each for a little bit until the life meter runs out, and often try new games. Again, 100% have been flash.
There are also tools & frameworks like Starling for converting either AS3 code, Flash assets, or full SWF files to other non-Flash platforms. For instance, I wrote the sorting algorithm in as3isolib, and noticed that Ubisoft ported one of their games using it to iOS, using Starling.
Flash is certainly alive and well.