It's almost impossible to fully measure the impact that Roy Halladay had on the Phillies and their millions of fans across the Philadelphia region.

So it was not surprising that news of the ace's stunning death in a plane crash in Florida on Tuesday produced an avalanche of grief on social media.

[Photos: A look back at Roy Halladay's Phillies career]

From fans to media to teammates and other local and national pro sports stars, tributes and condolences have poured in for the former ace pitcher.

Here is a sampling of reactions on Twitter and Instagram: