I just found an interesting site called
DailyLit, located here:
http://www.dailylit.com/
They offer both free books and copyrighted material.
Their philosophy is to offer enough of a selection every day for about 5 minutes of reading, until the entire work has been downloaded. Also, it looks like they offer a sense of community to their members, with questions for discussion and a participatory environment. I don't know if there's much action accumulating on the discussions, though.
Most of their free material is available here, I see, so perhaps there's not that much a surprise.
You might want to check it out for yourself.
I'm not affiliated with them in any way.
Don