tag, 'thread' & 'post'

[Ju]

1) I found the word 'tag' appeared in Facebook and other similar websites. What does 'tag' stand for in that situation?


2) In UsingEnglish.com, I found there are "submit new thread", "new post", 'My post", "unanswered threads" to click on.

a) Are "thread" & "post" interchangeble in usage?
b) What are the difference between 'thread' & 'post' in meanings &
usage?


Tks / ju

[nonsense]

To 'tag' something means to mark it as special or separate. It could also mean to add a label that will help with searches. I don't use facebook, so I'm not exactly sure in that context.

A thread is a string (or collection) of posts. A post is each person's comments within the thread. Your question above is a post. My reply is also a post. Combined together (and including all other replies after), they make a thread. A thread my have many posts; a post is part of a thread. The forum will have many threads, and each thread has its own topic.