What is your meaning of "plausible deniability"? In cryptography, this is the fact that data cannot be confirmed to be encrypted. In other words: you see a file

What is your meaning of "plausible deniability"? In cryptography, this is the fact that data cannot be confirmed to be encrypted. In other words: you see a file or read some raw data and you cannot prove that this is encrypted data vs random bits. What kind of plausible deniability do you expect from Twitter? The app may leave numerous traces in the phone and this has nothing to do with Twitter but it is just the way things work. Once you know that Twitter was installed, where do you see room for plausible deniability? Point two: you do not know whether the accounts were deleted. They may have been suspended/masked/whatever. Point three: well, if you are taking into account internal espionnage, do you expect that the data from within Twitter will only be retrieved after the imprisonment?