I really like that entry number three is a "square" for social media purposes. Also like the way the slogan and name of foundation fits. Don't love the people objects - so common of logos these days.
Number 8 has too much going on.
I like number 7 - the variety of colors and while i am not a fan overall of the icon type people shapes - i do like the little kids above the heart.
Number 6 is simple and nice but a little too common with the adults and kids icons in the middle of the heart.