Twitter is a breeding ground for insider threats to run amok within ~1.3 billion user accounts, including those that belong to high profile celebrities, business leaders,  politicians, and personal contact of interest (like ex-boy/girl friends, etc.).  

Consumer-facing companies often prioritize customer features instead of implementing security systems and overlook the potential ramifications until it's too late. 

Security needs to be seen as a feature, not something you keep putting on the back burner.