已知数列\(\{a_{n}\}\)首项\(a_{1}= \dfrac {1}{3}\)，且满足\(a_{n+1}= \dfrac {1}{3}a_{n}\)，设\(b_{n}+2=4\log _{ \frac {1}{3}}a_{n}(n∈N^{*})\)，数列\(\{c_{n}\}\)满足\(c_{n}=a_{n}⋅b_{n}\)．
\((\)Ⅰ\()\)求数列\(\{b_{n}\}\)的通项公式；
\((\)Ⅱ\()\)求数列\(\{c_{n}\}\)的前\(n\)项和\(S_{n}\)．