7 points to remember when Building your links exchange

Before requesting or agreeing to a link on a page make sure of the following:

7 Link Building Guidelines

1. The page is indexed in major search engines

2. The webmaster is not using "no follow" tags on the links.

3. The page is not blocked from search engine spiders via the robots.txt file

4. The link is not actually a CSS link which does not pass page rank (actually not a real link but a CSS class with an on_click event that redirects the browser).

5. The fewer outbound links the better, especially avoid pages that are nothing more than lists of links.

6. No gambling, prescription, hate, spam, link farm, etc. sites (unless, of course, your site matches one of those categories).

7. Ignore all "Spam" reciprocal linking requests. Spotting Spam should be easy for you as the messages sound canned and non-personal.



Ref:http://www.topicalseo.com/link-building-guidelines/