Very interesting indeed !
These are all possibilities that could be added to Stackideas applications...

Hi Philippe, yes!

i am testing this app on my IPBoard website and just find it great,
imagine you can create a very specific actions, here some scenarios :

When a member LOGIN, if his membership is bigger then 7 days AND his content count is 0 then send him a private message (or email) to encourage him et present him the most active pages on the website.

When a new member login Wait 5 minutes and then send him a welcome private message (wait 5mn to not think that this message is automatic for example)

When a member LIKE a content (or reply) send him a notification to thank him

In this app you will find all possible rules (member login, profile update, add photo ..) with conditions and actions to do (send messages, emails, manipulate profile, create new discussion, add photo ..)

This kind of apps will definitely makes websites very intelligent and interactive with members and visitors!