Not long ago, actress yuanshanshan triggered a hashtag “get out of entertainment” on sina weibo.

不久前，袁姗姗在新浪微博上被贴上滚出娱乐圈的标签。
A hashtag is a word or a phrase prefixed with the symbol # 标签就是附有前缀井号键的字词。

In reaction to this cyber violence, yuanshanshan totally reversed her image and gained great number of fans almost overnight by just showing off what Chinese call "vest-line abs".
袁姗姗对此网络暴力的回应是，秀出马甲线，彻底扭转自身形象，并且迅速涨粉。
Cyber violence 网络暴力
涨粉，gain fans，
show off，炫耀，晒的意思，比如晒幸福就是show off happiness
马甲线 vest-line abs

Probably one of the fastest ways to become a Web celebrity in China today is to show off the outstanding figure you've gained through hard training。
当今在中国网红的最快方法大概就是晒一晒你拼命健身后的好身材。
Become a web celebrity 变成网络名人，也就是网红。
An outstanding figure 好身材

It is becoming the social media’s most popular fads. 它变成了社交媒体的最新风尚。