Love is a pristine pure thing God has ever created.It is not something that can be proved but it is something that can be felt with an open heart and a peaceful mind. So the real love or true love is something brighter than the Dimond,stronger than the iron, softer than the sponge and perennial like this universe.It is omnipotent and omnipresent.So we just have to feel it and flow in its direction without being any obstruction:)
Just like a religious faith in God, Ala, or Budda. Some people have very strong belief in their religion whereas certain other people are absolutely atheism. It is a pity there is no scientific tools that can be used for measuring the degree of love in the world by now.
Love is a sort of natural call, a natural affinity or attraction among people.