Forced to 'do a Skyfire' and suspend downloads for the time being.
Mobile startup Kik has seen 450,000 people download its Kik Messenger app in the ten days since it was launched for iPhone, Android and BlackBerry.
The app - which offers BBM-like instant messaging across different smartphone platforms - has been so popular, Kik has been forced to temporarily remove it from stores, while it upgrades its servers.
(A tactic also adopted yesterday by mobile browser firm Skyfire).
CEO Ted Livingston has given VentureBeat some more details about the company's plans to use Kik Messenger as the basis for ambitious streaming media sharing.
Users will be able to stream the music that they're listening to to other devices - something that also works for photos and videos.
However, this is also something that will prick up the ears of rightsholders, particularly in the music industry, who are wary of startups looking to launch this kind of feature without signing licensing deals.
Kik has yet to launch the feature though, so it may well be in talks about that already.