Tweets are mysteriously disappearing from Twitter

Twitter's most retweeted tweet of all-time has vanished from the platform.

Users of the social media service began buzzing late Tuesday afternoon that tweets are mysteriously disappearing.

Tweets that have vanished include actor Cory Monteith's last tweet before his death, Ellen DeGeneres' viral selfie-which racked up more than 3.4 million retweets at one point-and a breaking news post from @CNBC.

(Read more: Facebook buying virtual reality firm Oculus for $2 billion )

"At least I got the tweet framed before it got deleted," a fan of Justin Bieber posted along with a frame showcasing a tweet that can no longer be found on the singer's profile.

Editors at various media companies also said they noticed posts were vanishing.

Twitter says it is "currently researching a bug that has caused some tweets to not be displayed."

Twitter's hiccups come as Facebook announces its $2 billion acquisition of virtual tech firm Oculus and as Instagram says it now has more than 200 million monthly active users. In total, Facebook now has 1 billion monthly active users of its apps, while Twitter's mobile app is utilized by 184 million users each month.

By @CNBC's Eli Langer. Follow him on Twitter at @EliLanger.