Brenda Figueroa's son, Joshua, turned 12 on Tuesday, and she started the page so he could have birthday greetings. He has trouble making friends, he said.
"When I'm trying to make friends, sometimes the kids ignore me," he said.
After NBC 4 New York's report on the family Tuesday, well-wishers have flocked to the page and posted happy birthday wishes from around the nation.
"Looks to me like you have lots of friends Buddy. I'm glad I can be one!!! Happy Birthday Joshua!! I hope your day was all you wanted it to be!!!" wrote one poster.
"You are a special guy and I hope you had a great birthday," wrote another.
"God gives special kids to very special moms, and thou I don't know you, I can tell you are special," another poster said.
Figueroa posted a thank you to all of Joshua's Facebook supporters, saying her son was thrilled to see how many people care for him.