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Social media website Reddit has about 52 million daily users. With forums called "subreddits" on almost any topic you can think of, Reddit can be a good place to practice your English.
You might already know that LOL means "laugh out loud" and TL;DR means "too long; didn't read," but there are a lot of other internet abbreviations you'll see on Reddit and other similar websites.
The person who starts a thread in a subreddit is called "OP," meaning "original poster." And during an "AMA" — or "ask me anything" — the OP writes who they are and other users are invited to ask them any questions they have.
Anyone can do an AMA, but they are often started by people with unusual jobs, stories and experiences to share. Sometimes AMAs are done by famous people — even Barack Obama has done one. You can find AMAs on a lot of subreddits, but the home of the AMA is r/IAmA.
You can learn a lot from AMAs, so you might have a chance to use the abbreviation "TIL," which means "today I learned." It is usually written before someone shares a new fact that surprised them. In fact, there's a whole subreddit for people to share new things they have found out called r/todayilearned.
People ask a lot of questions on subreddits, but they aren't always answered by experts! When someone thinks they know the answer to a question or has a useful piece of information, but they aren't 100% sure that it's correct, they might write "AFAIK," meaning "as far as I know."

🌏Summary
社群媒體網站Reddit討論主題五花八門，是一個讓您練習英文的好地方。在Reddit上，您可以看到許多英文縮寫網路用語。LOL指的是「大聲地笑」，TL;DR的意思是「太長了；沒有看」，「OP」意思是「原始的發文者」，也就是原PO。 當有人覺得他們知道某個問題的答案，但又沒有十足的把握，他們就會寫「AFAIK」，意思是「就我所知」。

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