Hey Neil, there is neither a delete or reverse option to the posts that you place here, as there is to your own life. (Not talking about the extremists who throw their computation devices out of the window alltogether and for good...).
There are forms of modification of statements and post however, just as in real live again, which pretty much is the only option to deal with a given sitiation in the first place.
Look at me, for instance, PO is always present in the lower monitor on the left (I turned it off when this this pic was taken). PO-awares are not welcome or understood widely, you have to learn to hide this knowledge, just like others learn to hide assets from taxation.