Some users may not be seeing the latest Tweets in their timelines. We’re currently investigating this issue.
— Twitter Support (@Support) May 19, 2014
Hopefully the service will return to full steam soon. We’ve reached out to Twitter and will update when we hear back.
Update: Twitter has posted the following on its status page:
Between 13:26-14:39, some users may have experienced a delay in Tweets showing up in their home timelines. This issue has now been resolved. We apologize for the inconvenience
Photo: LEON NEAL/AFP/Getty Images