I don't think it is a violation of hte Order of Protection but it is probably a different crime.
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Depending upon what your order requires, it may be a violation.
It is more likely an invasion of privacy and/or identity theft, if he is pretending to be you in order to change your settings or post as you. You may wish to bring his actions to the attention of the court which issued the order.
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Whether it is a violation or not depends upon the actual terms of your Temporary Order of Protection. I would contact the DA to let that person know what is going on. It is either a violation or some sort of ID theft crime.