Leave their personal accounts alone: Don't contact them about work through their personal email, cell phone, Facebook. Most people don't like to mix their personal and professional lives, so don't corner them into doing it. However, if they engage you first through these accounts, it is OK to reply to them.

不要用私人通讯方式联系：与对方联系时不要用对方的私人邮箱、手机号、等。很多人不喜欢把工作与私人生活搅在一起，所以不要让他们面对这种情况。但是，如果他们先用私人帐号联系你，就可以回复他们了。