MK,
Don linked to this so I figured I'd answer. What a fine fellow he is, eh?
OK this is all to do with links, ie the jumps from site to site that make the Internet work. vBulletin, the forum software we use, invented linkbacks, trackbacks and refbacks - a way to increase link numbers and raise a site's profile in the search engines, as well as providing a way for people to jump to another site that has relevant info.
These things aren't worth worrying about from our point of view because we have over 20,000 links to us out there on the web, but for newer or smaller sites they are handy: a quick & built-in way of getting links from other sites. In other words you fill out the linkback/trackback/refback or whatever and the server does something that helps us get a baclink from another site mentioned in your post - for example it pings them or tells them we're linking or tells us we are linking back or should link back etc.
The various confabulations created by vB make my brain hurt, and we don't need to get into that game, so we basically ignore it.
If you ever wanted to create some links to ECF, and/or your posts or your social group/s on ECF etc, then there are better ways such as answering questions on Yahoo Answers and putting in a link to here. Or, write an article about ecigs or about your social group, put a link at the bottom, and distribute the article to some of the hundreds of article distribution sites.
For example: you want to get more publicity on the Net for a women's ecigarette users self-help group on ECF. You write an article extolling the virtues of ecigs / your group / whatever, make it about 500 words, put a 'Johnson box' at the foot (a byline with your name and the link you want to promote), and then post that article on 50 article distribution sites (which are free). Or pay someone $10 to do 100 sites for you, there are dozens of contractors who will do that (they have software set up to make it easy for them).
There you go - a primer on links...