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Known issue since patch 6.1
Blizzard added stuff that requires a taint-free approach to hooking "ChatFrame_OnHyperlinkShow".
The solution i used in my own addon was to:
1. Post-hook "ChatFrame_OnHyperlinkShow" (hooksecurefunc).
2. Pre-hook ItemRefTooltip:SetHyperlink(), adding some code that returns nil if the hyperlink in question matches that what my addon uses internally (i.e |cffffff|Hmycustomtype:data:data:data|h|r).
If you want to use the twitter-feature you can also just type "/share" in chat (don't know if customized UI messes things up).
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