I wish they will succeed. However, those knowledge database are always going to be hard as knowledge is a moving and asynchron entity. What I mean is that something that is true today may not always be true. Also, if a group learns something through jelly, that knowledge isn't propagated to all the the people using jelly which can lead to a lot of duplicates. I hope the moderating will be good. On the other hand, an iphone app can provide a lot of information and context about the question which might help Jelly show questions related to the place/time. Quite a hard problem indeed.