It is important to note that the Latin that we read is the language of a highly literate elite, and not necessarily the language as it was ever commonly spoken. Verbal markers such as a change in pitch will adequately indicate a question when speaking, but such markers cannot be recorded in writing. Latin has no punctuation system as we understand it, but uses its own system of markers to indicate senteces, questions etc. Markers such as verbs at the end of a sentence, 'et', 'nec', and a host of other words indicate breaks in thought. The enclitic -ne is the equivalent of a question mark in a writing system that has no question mark. In other questions, a question word such as cur, ubi etc will suffice.
The only thing we can guarantee when communicating via the internet is that we will be almost completely misunderstood, and likely cause great offence in doing so. Throw in an attempt at humour and you insure a lifelong enemy will be made.