Posts to Community health initiative/Interaction Timeline discussion pages on Meta and ENWP about the completion of Version 1.
Contact participants in the discussions on both wikis to invite to use tool.
Announcement post on Meta Forum, ENWP VP/M, ENWP WP:AN.
Announcement post on Facebook Wikipedia Weekly
Blog posts; one for a general "how this tool can be used" and second one for the technical build, how people can use the API in their own projects, and how people can contribute to the Timeline.