I like Mothering for very young gifted kids- there are also some parents of elementary and up.

It's a lot of "do you think my child is gifted" type questions. I like responding to those because it brings back memories of confusion, pride, and feeling timid about asking such a loaded question on a forum.

One person advised taking the question to a general forum, counting how many times people got snarky or outright accused you of lying, then you'll know your kid is gifted:) Funny.