It is like working on a muscle car in one's garage. Hobby. I enjoy it. I think there are (some) other people who remain interested. When I have indicated that I might stop doing so...people ask me to continue doing what I do. I might have an effect on scholarship. etc.
And there is always the outside chance that some current or future judge, judge's law clerk, or practitioner might be reading my tweets. I post at CONLAWPROF--and at least 1 Article III judge participates. And a different Article III judge once responded to one of my blog posts [at New Reform Club].
Brief for Scholar S.B.Tillman & the Judicial Education Project as Amici Curiae in Support of the Defendant, Blumenthal v. Trump, Civ A No 1:17-cv-01154-EGS (D.D.C. Sept. 19, 2017) (Sullivan, J.), ECF No. 16-1 (redocketed ECF No. 40), 2017 WL 4230605, https://ssrn.com/abstract=2996384…;
Brief for Scholar S.B.Tillman & the Judicial Education Project as Amici Curiae in Support of Neither Party with Respect to Motion to Dismiss, DC & MD v Trump, individual capacity, Civ A No 8:17-cv-01596-PJM (D Md May 8, 2018) (Messitte, J), ECF No 114, https://ssrn.com/abstract=3174268…;