Ken Griffey Jr. and Mike Piazza are baseball's newest Hall of Famers.

After the initial shock, amazement and joy wear off, both superstars are going to have to return a lot of texts and voicemails.

Among the congratulatory notes on Twitter:

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Congratulations to @mikepiazza31, an outstanding ballplayer and a great man. #HOF2016 pic.twitter.com/kLqzBONSsE

— Tommy Lasorda (@TommyLasorda) January 6, 2016

#congratulations to Mike Piazza and Ken Griffey . Next year will be Bagwell's.

— Billy Wagner (@wagsk13wjs_e) January 7, 2016

Congrats to Mike Piazza and Ken Griffey Jr. On their selection to the HOF.. Well deserved.. Welcome to the family

— Tom Glavine (@Tom_Glavine) January 6, 2016

Congrats to Mike Piazza! I love to have another catcher on board! @MLB @Mets

— Johnny Bench (@Johnny_Bench5) January 6, 2016

Congrats to #GriffeyJr on the #HOF ! Amazing memory when I faced him in my 1st ST. 7th inning, they anncd his name and I thought holy s***!

— Justin Verlander (@JustinVerlander) January 6, 2016

Juniors ball cap has to be backwards on his plaque right? #HOF2016

— Bryce Harper (@Bharper3407) January 6, 2016

Congrats to one of my child hood idols! #HOF #MikePiazza #ShowGoat @mikepiazza31 pic.twitter.com/SJnhWSicmb

— Jp Arencibia (@jparencibia9) January 6, 2016

3 people...Raise your hand if you didn't vote for JR. Then slap yourself with the other..

— Adam Eaton (@AdamSpankyEaton) January 7, 2016

Congratulations to Ken Griffey Jr. and Mike Piazza. Extremely honored to have called one a teammate and competed against the other. #HOF

— Brandon Morrow (@2Morrow23) January 7, 2016