Modern vocab. "selfie", "troll" and "spam"
selfie n. (also selfy, pl. selfies)


  自拍 n./vi. (adj. 自拍的. Also specifically 自拍照片 (selfie photo) or 自拍视频 (selfie video))
  
  
    
    n. 这是他的自拍。
    vi. 他正在自拍。
    
  


troll n.


  (Mainland China) 喷子 n.
  
  (Taiwan) 白目 / 白爛 / 小白 n.


Note: As the Internet slang is widespread, 喷子/白目/白爛/小白 are all acceptable in Chinese regions. However, the term 小白 in mainland China now can mean 菜鸟 (newbie, green hand), for example

新来的小白，请大侠指教。


Then it's an almost neutral word.

spam n.


  垃圾 + 邮件/短信/信息 n.


The spam in English includes unsolicited bulk messages in all kinds of media. However in Chinese it's more specifically said 垃圾邮件 (and something else like that).

phishing scam n.


  钓鱼骗局 n.


I checked some websites and found 钓鱼骗局 is used both in mainland and Taiwan for "phishing scam". However personally I don't meet the word 钓鱼骗局 much. More specific words like 钓鱼网站, 网络钓鱼 (Taiwanese 網路釣魚) appear more common. Anyway, the core word is phishing (钓鱼), the derivatives are based on it.