I think the next thing is fully auditable trails for all information, beginning with text. For example:
"The sky is blue" ->
signed by Alice ->
Bob vouched for Alice ->
Cindy vouched for Bob ->
Dom vouched for Cindy ->
Dom is in my own list of vouches ->
Therefore I can reliably trust Alice's report that the sky is blue.
(The reliability of this information will increase with multiple vouches throughout this tree.)
A consequence of this type of information structure may be that traditional authoritative sources of information will become irrelevant almost overnight, because reliable and auditable word of mouth will outweigh a professional reporter anyday.
Next after that is the same thing, but multi-directional. This is a much longer chain, but much more useful too. Example:
"There is a person who needs help at location X,Y" ->
Signed by Alice ->
"I'll reimburse and reward whoever helps the person at location X,Y" ->
Signed by Bob ->
"I helped the person at location X,Y by doing Z" ->
Signed by Cindy ->
"I observed this and it really happened" ->
Signed by Alice ->
"I gave Cindy a gold nugget weighing 0.1 oz" ->
Signed by Bob ->
"I received a gold nugget weighing 0.1 oz from Bob" ->
Signed by Cindy
"I witnessed this exchange" ->
Signed by Dom
A logical consequence of this information structure is rapid slide into irrelevance of traditional commodity currencies and radical decentralization.