In general, security is never perfect, so imagining the perfect binary "secure or insecure" isn't useful. Instead, think about it in levels. Is something secur

In general, security is never perfect, so imagining the perfect binary "secure or insecure" isn't useful. Instead, think about it in levels. Is something secure from a casual observer? Is it secure from your teenager who can devote a lot of time to it? What about a professional who devotes a lot of time to it? What about a court order? What about a concerted effort from the government to build an ASIC farm to crack your encryption? You could look at this in the same way. Is your tweet visible to a casual observer? Is it available to a dedicated searcher? Is it available to a technically competent outside searcher? Is it available to police without a warrant? Is it available to someone with superadmin on the database inside Twitter? When you think about it that way, the general utility of the service should be obvious.