One idea behind the project is to try to optimize attention people need to spend on participation.

The idea would be to try to make it so that system would help you be notified of things you want to be notified on. You can always override this and be notification about everything (or nothing), but you can also be notified in a "smart" way.

Some ideas for that:

• measure how much people talk on the portal and invite those who have not yet talked, but have talked and participated in the past on similar topics (also using what they read, not just where they activelly participating by writing: Measure how much people read and display this next to their name #48)
• same for voting, invite those who didn't vote yet (this might leak information on who voted and who didn't, but this is less sensitive)
• we could also see on which topics people have strong opinions and invite based on that (that might leak some information about votes themselves though)
• use a measurement how contentious an issue is and start inviting more and more people (even if they are less interested in some subject)
• we could use information about delegated votes to see how much delegated votes agree and if it is split, we invite the person to vote themselves
• we could simply do a random sample from all population and ask/require them to vote

This would not introduce a filter bubble in my opinion because users would still be able to see everything if they want, and train our system on new topics. Moreover, if something is contentions, our system would start inviting more and more people. It is just that if they want a quick look they can get a quick look based on what they found important in the past.