"Scrolling is a continuation; clicking is a decision" @bokardo – Online there is no "fold" – http://hubs.ly/y0P9Vs0

The issue isn't whether the call to action is visible. The issue is whether your call to action is visible at the point where someone has become convinced to take action.

On the Web, people use the concept of “above the fold” to support layout decisions, call to action designs, ad placements, and more. Here’s why most of these arguments won’t fly.