Cape Town - Social network Twitter experienced connectivity problems among some users on Thursday just after 12:00 South African time.
Fin24 found that the Twitter website was down and posting tweets on other Twitter services such as Tweetdeck failed to work at the time of writing.
Local technology news website MyBroadband has also reported downtime on Twitter.
However, tweets still appeared in the timeline on the Tweetdeck system, Fin24 found.
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Twitter at 12:20 South African time had not yet commented on the possible downtime on its status page.
Other Twitter web pages for individual users were also down on Thursday.
UPDATE: Just after 12:40, the Twitter website was live again and it was possible to post tweets again.