So up to now I've been operating under the assumption that anything I transmit/receive over low-bandwidth, unencrypted channels such as email, IM, sms, etc. are

So up to now I've been operating under the assumption that anything I transmit/receive over low-bandwidth, unencrypted channels such as email, IM, sms, etc. are likely intercepted and stored forever dragnet-style. I was also guessing that higher bandwidth channels such as voice chat, phone calls, video conversations, etc. were likely intercepted more selectively because of the difficulty of doing something like that en masse (and in the case of phone calls, because of laws (ha)). I'm starting to think that I've just been grossly naive.