You can interlink different campaign types and backlinks together allowing you to create different "tiers" of links.
So for example:
1) First campaign you create will be web2.0/wiki
2) The second campaign you create will be twitter retweets. Now, in the second campaign you have the option to set the first campaign as "parent". This means that all twitter retweets are being send to the web2.0/wiki posts from your first campaign. Basically creating backlinks TO your backlinks.
This is just a simple example, you have total freedom in how to set this up yourself and you can make it as crazy is you would like.