Outside of the cross of Jesus Christ, there is no hope in this world. That cross and resurrection at the core of the Gospel is the only hope for humanity. Wherever you go, ask God for wisdom on how to get that Gospel in, even in the toughest situations of life.
We are told to let our light shine, and if it does, we won't need to tell anybody it does. Lighthouses don't fire cannons to call attention to their shining - they just shine.
The primary source of the appeal of Christianity was Jesus - His incarnation, His life, His crucifixion, and His resurrection.
To the casual observer, the Dropbox demo video looked like a normal product demonstration, but we put in about a dozen Easter eggs that were tailored for the Digg audience. References to Tay Zonday and 'Chocolate Rain' and allusions to 'Office Space' and 'XKCD.' It was a tongue-in-cheek nod to that crowd, and it kicked off a chain reaction.
There is only one secure foundation: a genuine, deep relationship with Jesus Christ, which will carry you through any and all turmoil. No matter what storms are raging all around, you'll stand firm if you stand on His love.