Twitter, page-3498

Im sure it's not a big deal but i went through Alex's twitter and noticed he deleted a few tweets including ones indicating he was in japan and China recently. Could very well be because they were more personal tweets, but i wonder if in light of ML incident with avz, there was potential information contained either within or in replies that alluded to confidential information. Clutching at straws here but just curious as to the deletion. Apologies, im not on twitter so not sure if its common to delete tweets days after posting unless it has caused issues...