♥♥♥Hold down the alt key and press the 3 on the key pad- ☼☼IT MUST BE ON THE KEYPAD NOT ON THE ROW OF NUMBERS☼☼!! If you want to make more than one heart, you must take your fingers off both keys before typing it again.♥♥♥
or if you have a mac, you can use the symbol < (press shift and ,)
and the 3 together:
when you post the comment with this symbol it becomes the filled in heart.