简单英语句子成分分析

where you can have profiles地点状语从句修饰sites.
which explain every detail of your life是定语从句修饰profiles
缩句为there are sites.

况且（更重要的是），有无数可以发布个人资料的网站，其中展示着你生活的每个细节。
What's more, there are countless sites where you can have profiles which explain every detail of your life.

缩句为facebook makes it easy and there are greetings.
that getting one means nothing为结果状语从句。
由于facebook把它变得异常容易，出现了很多千篇一律的问候，收到它们毫无意义。
Since Facebook makes it so easy(it becomes almost a given) and/or there are so many cookie-cutter greetings that getting one means almost nothing.

It seems that silence is gold,