Facebook unveiled an upgraded “Like” button for responding to posts on its social network, adding options for “love”, “haha” ,“yay”, “wow”, “sad” and angry”, each with its own icon. This will give the company more data with which to personalise its users' news feeds. 

请问：

(1) adding 的逻辑主语是？

【答】adding的逻辑主语是Facebook。

我发现这位网友经常问非谓语动词的逻辑主语是谁。给你支一招：判断分词短语的逻辑主语，首先看语义，辨明该动作是谁发出的？一般有两种情况：如果是句子的主语发出的，那么就是作状语，如果是它前面的那个名词发出的，那么就是作定语。不知你明白了吗？

举个例子：

He fell from his motorbike, breaking his leg. (breaking his leg作结果状语)

Do you know the man standing by the window? (standing by the window作定语)

(2) which 指的是什么？

【答】which是关系代词，指代前面的data。