So the 4 sites in your signature are all running on one DNN install and you just want to place a link on each one linking to each other one?

I don't see this as problem from the DNN side of things, but some of these links may seem "unnatural" ... for instance what value do you provide to visitors by linking from Beeb iPlayer to Class Campers? So while technically possible, such a link would not add all that much boost to your SEO efforts.

Let me know if you have further questions or if I misunderstood something.

Hi albert,

My opinion is different.

If you like to recommend, link to, other sites, your's or not, on your dnn instance, or not, do so.

Google as they said, like the web to be (much more) social. You're recommending other what to see is the very basic of social.

Some might like to visit those sites, other not, that is always true.