Tweetbot 1.3.3 for Mac, and 2.8.5 for iPad and iPhone, does not require confirmation of (1) follow or (2) favorite actions, which allows remote attackers to automatically force the user to perform undesired actions, as demonstrated via the tweetbot:///follow/ URL.
Exploitability
AV:NAC:MAu:NImpact
C:PI:PA:P6.8/AV:N/AC:M/Au:N/C:P/I:P/A:P