Sometimes something that makes no sense, is completely offtopic, or just utterly stupid gets the best laughs.
有时那些不可理喻、与主题完全无关或极其愚蠢的东西却博得最多的笑声。
《柯林斯英汉双解大词典》
2
Sure, it has its fair share of offtopic tweets, but no more offtopic chatter than you’d find in your typical chat room or forum.
当然，这是合理的话题分享，比起你在聊天室或者论坛找到的话题来说，twitter的话题实在是太多了。
3
For this document we will only discuss the first step of identifying the type of logon data, the rest is specific to the authentication source being supported and hence offtopic.