Velocity Reviews - Re: What do they call this?

Sarah Houston wrote:
>> Someone was asking me about this and I recalled seeing something
>> about it awhile back, but didn't remember what it was called.
>>
>> Say someone has a small business that they want to advertise like
>> crazy all over the country, for example maybe they sell used auto
>> parts from their junk yard.
>>
>> They have parts that maybe someone else doesnt, in other parts of the
>> country. Yet they cant afford a huge ad budget.
>>
>> So they have this banner ad box that they can place the code for, on
>> their web page, and it rotates ads all over the country, for used
>> auto parts places, so his ad goes all around to everyone else in the
>> group's sites, and theirs rotates in and out of his. No one has to
>> pay anything, but their ads get rotated in and out of thousands of
>> other sites per day.
>>
>> What do they call that?

http://en.wikipedia.org/wiki/Link_exchange