Is it okay na payagan ang kids na magkaron na ng facebook account ? I have 6 and 7 year old kid .

I think when they approach High School, it's more appropriate of a time to create a FB account. Although, even at that age, it really comes down to how strict you are and how well you monitor their activity on the internet. Personally, I think if you vigilantly watch over what they do, around 12 years old is okay...but you have to be extra secure and cautious.