Clearly Twitter is not at this stage just yet.
In this last stage, individuals begin to come to terms with their mortality, or that of a loved one, or other tragic event. This stage varies according to the person's situation. People dying can enter this stage a long time before the people they leave behind, who must pass through their own individual stages of dealing with the grief.
For those dealing with a break up:
Moving on from the situation and person is the last stage. The person accepts that the relationship is over and begins to move forward with their life. The person might not be completely over the situation but they are done going back and forth to the point where they can accept the reality of the situation.