My answer on july 27th, 2009:
At first I think “compelling content” is highly personal. Dependent on mood, balance between work and sparetime, situation at home and the way you think, feel and act in life (e.g. Maslows hierarchy of needs).
What’s NOT compelling? RT too much newsfeeder kind of stuff.
1. Things that make me think and reconsider my points of views in life, concerning history or the “others” in general.
2. New killer app kind of stuff.
3. Pointing at interesting people (not necessary twitters). To be a guide in the world with all it’s wonders and triviality.
4. Max of 6 tweets a day!