如图所示,\(F_{1}\)是抛物线\(C\):\(y^{2}=4x\)的焦点,\(F_{i}\)在\(x\)轴上,\((\)其中\(i=1\),\(2\),\(3\),\(…n)\),\(F_{i}\)的坐标为\((x_{i},0)\)且\(x_{i} < x_{i+1}\),\(P_{i}\)在抛物线\(C\)上,且\(P_{i}\)在第一象
限\(\triangle P_{i}F_{i}F_{i+1}\)是正三角形.
\((\)Ⅰ\()\)证明:数列\(\{x_{i+1}-x_{i}\}\)是等差数列;
\((II)\)记\(\triangle P_{i}F_{i}F_{i+1}\)的面积为\(S_{i}\),证明:\( \dfrac {1}{S_{1}}+ \dfrac {1}{S_{2}}+ \dfrac {1}{S_{3}}+…+ \dfrac {1}{S_{n}} < \dfrac {3}{8} \sqrt {3}\).