You could send a DM to everyone you know with an shortened URL that links to a page full of malware and evil that pwns their computer, steals all their data and

You could send a DM to everyone you know with an shortened URL that links to a page full of malware and evil that pwns their computer, steals all their data and account log ins, and uses their machine as part of a botnet. Because the DM would come from you, a person they know, the person is more likely to trust the page or file that's linked to and less likely to catch it brutalising their computer. The actual data on your Twitter account might not be valuable in itself, but it has significant value as a vector for other attacks.