你知道，過(guò)去更多的是買(mǎi)一塊昂貴的手表或者一個(gè)包包來(lái)炫耀。而現(xiàn)在更多的是在社交媒體上分享去過(guò)的充滿異國(guó)風(fēng)情的地方。

過(guò)去（這樣的人或行為）多數(shù)是買(mǎi)名貴的手表或包包然后去炫耀，現(xiàn)在更多的是在社交媒體上“曬”他們都去過(guò)國(guó)外哪些地方。

翻譯就不翻了，這個(gè)句子關(guān)鍵是理解where所指的對(duì)象，where指的是社交媒體，過(guò)去是在社交媒體上曬你所買(mǎi)的東西，現(xiàn)在是在社交媒體上分享你所去過(guò)的地方。

in the past where it was more about buying an expensive watch or a bag,是Know的where引導(dǎo)的賓語(yǔ)從句，
而 showing that off是know的動(dòng)名詞賓語(yǔ)；
much more about sharing ...是表語(yǔ)成分，里面包含about后的介詞賓語(yǔ)，由sharing引導(dǎo)的動(dòng)名詞結(jié)構(gòu)構(gòu)成，
sharing里面還包含一個(gè)定語(yǔ)從句 that you've been to，修飾 places。

我認(rèn)為去掉where也不影響句意，where在這只強(qiáng)調(diào)對(duì)比關(guān)系。類似以下情況：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.