micmak.....a very good point.
In my personal assessment, if full stops at the end of a sentence indicates a pause, then surely by definition it would indicate that there is more to follow, but rarely doe this happen.
It may well be, that the post contains so much nonsense, that the poster is totally embarrassed,or at a loss, to finish the sentence.
Quite often it indicates a very clever, but smart@rse reply that not only does the poster become confused, but succeeds in confusing others, a sort of "that concludes the evidence for the prosecution" type of thing.