In Esther 4:14, Mordecai is telling Esther to remain silent, he said "For who knows, whether you have come to the kingdom for such a time as this."
Truer words were never spoken. Who knows why God places us where he does at the times he does. Who knows what lives we might effect just by being in a certain place at a certain time. Look at your Facebook friends for example.
I get blessed daily from the people I grew up with and went to school with. I haven't seen many of them for years, but I see their Christianity, their family values and their faith in God daily on their Facebook page.
When I joined Facebook, I would never have thought I would learn so much about my friends or be so blessed by them.
But God had a hand in even that. He has a master plan and we just need to follow the blueprint He has given us by following in His word. For "who knows" where and when we will be in a moment "for such a time as this".