White heart symbols are a part of the ALT codes. ALT codes are used in place of keys that can not be added by the keyboard alone. There are two ways to make a heart on Facebook that I have found. One is by holding the ALT button and pressing the number 3 and the other way is typing in < plus 3 and that will also make a heart.
<3....dont use a space between the < and the 3
All you have to do is make one of the<> signs and put the 3 then theres your heart
If you are on a desktop, hit "Alt" and "3" (the one on the right side of the keyboard) at the same time, and a heart symbol will appear! If you have a laptop and wanting to know how to on facebook, type "<" and "3"
like this .. _|_
There are various websites which provide symbols which can be copied and pasted onto Facebook. Using one of these sites, you could make a fire symbol on Facebook.
I am not sure what you mean by a heart notification. If you are asking how to make the heart symbol on Facebook, you use this < and put the number 3 next to it (no space). <3 will print out as a heart. If you want a thumbs up sign, use open parenthesis, the letter y, and close parenthesis (y).
flying
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(o) (o) ____
thts worng
heart
just make it!