你知道，过去更多的是买一块昂贵的手表或者一个包包来炫耀。而现在更多的是在社交媒体上分享去过的充满异国风情的地方。

过去（这样的人或行为）多数是买名贵的手表或包包然后去炫耀，现在更多的是在社交媒体上“晒”他们都去过国外哪些地方。

翻译就不翻了，这个句子关键是理解where所指的对象，where指的是社交媒体，过去是在社交媒体上晒你所买的东西，现在是在社交媒体上分享你所去过的地方。

in the past where it was more about buying an expensive watch or a bag,是Know的where引导的宾语从句，
而 showing that off是know的动名词宾语；
much more about sharing ...是表语成分，里面包含about后的介词宾语，由sharing引导的动名词结构构成，
sharing里面还包含一个定语从句 that you've been to，修饰 places。

我认为去掉where也不影响句意，where在这只强调对比关系。类似以下情况：You use where to introduce a clause that contrasts with the other parts of the sentence.
??Where some people learned to play the accordion for dances in their community, others took music lessons...
??Sometimes a teacher will be listened to, where a parent might not.