Before the internet became popular, many people communicated with friends through BBS.

BBS 是 Bulletin Board System 的缩写，意思是"电子公告板系统"。 Bulletin 指"公告、布告"，Board 指"板、牌"，System 指"系统"。合起来表示一种早期的网络交流系统，用户可以在上面发布和查看信息。