Charles Arthur has a great post on the value of links and your personal linking brand
That currency is the hyperlink, a pointer to somewhere on the internet that holds some information that someone else might find useful. Like any currency, it can be debased, and lose its value. You’ve heard of the dollar/yen/pound/euro exchange rate, of course (and watched in amazement as they gyrate, and yet the price of American hardware and software never alters from a $1 = £1 translation). But in the link economy, when everyone’s passing around links, every person is their own central bank, determining the value of their own currency.
He also mentions Rickrolling, which is a specific yet humorous instance of link fraud, where links promising further content send you to a Rick Astley video.
Link Inflation: too many links chasing too little content. A measure of how many links you need to follow to find content of interest.