This obviously only applies to sellers of craft items but craft juice is a great tool (website)
You submit your item from ebid (craftjuice will link back to your listing) and people vote for you (there is a blue arrow you click on)
When your listing gets 5 votes craftjuice will share it on their facebook page and twitter. I believe it also helps in google searches (so I have been told)
I have been using it for another selling platform I use but am now also using it for ebid.
On the forums on the other selling site we have a thread where we all link to our craftjuice listings and then vote for each other to help reach the 5 votes. Not sure if that would work, or would even be allowed here.