As 750 million users wait for Facebook to announce radical changes to its site at the company's f8 developer conference on Thursday, luckily for us, there's another social network called Twitter, where employee slip-ups were both born and perfected.

On Wednesday night at about 8:10 p.m., Facebook employee Ji Lee (@PleaseEnjoy) tweeted, The 'Listen with your friend' feature in ticker is blowing my mind. Listen to what your friends are listening. LIVE.

Soon after Lee posted the tweet, he deleted it from his account. A screenshot was taken before its removal, which then made its way around the Internet.

Earlier this week, Facebook launched the ticker feature, which allows users to follow their friends' actions in real-time. Judging by Lee's tweet, Facebook will allow friends to view what other users are listening to, most likely through an online music platforms like Spotify, and then choose to join the listening session. This functionality has potential to create listening parties between friends.

Representatives from Spotify, including CEO Daniel Ek, are planned to speak at the conference, which leads one to think that Facebook will indeed partner with the Swedish streaming music service to maximize this feature.

Facebook's motto for the f8 conference is Read. Watch. Listen. If Lee was alluding to the listen portion of the slogan in his tweet, then it's likely that Facebook also plans to announce similar social features for reading and watching content together, too. Bolstering this notion are the conference's other speakers, including Clear Channel executive (and MTV founder) Bob Pittman, Zynga executive Owen Van Natta, and CEO Billy Chasen.

Whatever changes Facebook announces on Thursday, we can expect them to be revolutionary. Mashable's Ben Parr can vouch for this:

I have seen what Facebook is launching on Thursday, and it's going to change the world of social media, he writes. And while I won't talk about the mind-boggling things Facebook will be launching, I will say this: The Facebook you know and (don't) love will be forever transformed. The news that will come out of Facebook during the next few weeks will be the biggest things to come out of the company since the launch of the Facebook Platform.

Facebook made a number of changes to its site this week to its News Feed and friends list. Now, your top stories and most recent stories are combined into one news feed, with each top story getting marked with a blue corner, and Facebook also made its friends list more similar to Google+'s Circles to allow users to post updates straight to the people who you want to view it.

The company also added the News Ticker, and added Subscribe buttons to each profile page, which allow users to follow each other's updates even if the two people are not friends.

Facebook's f8 developer conference is scheduled to start Thursday at 1 p.m. ET.