Flappy Bird was created in a secret lab somewhere with the goal of destroying people's souls and eliminating productivity. With these steps you can increase your score and reclaim some of your sanity.
Tip #1: Position your thumb in the bottom corner of the screen. Doing so will allow you to tap more effectively.
Tip #2: When flying between pipes, fly the bird as close as you can to the bottom pipe. It'll make it easier to judge when you should tap next.
Tip #3: This the most important! Focus on the birds eye as it's center. Time your taps to the position of the eye between the pipes.
Tip #4: To disable those annoying ads in Flappy Bird, put your phone in Airplane Mode.