When the McMillan Sand Filtration site project got started, the developers created a generic Twitter hashtag of #NewMcMillan which they used for a while -- and so did I.
And then the use of #NewMcMillan fell by the wayside. So I stopped using it, too.
The Friends of McMillan Park had their Twitter account of @McMillanPark, which I have been using in the absence of anything else.
But I suspect that tomorrow’s McMillan groundbreaking will include the introduction a new Twitter account or Twitter hashtag for the project.