Longurl.Net is changed. New design and new features. Now you can enter source URL and your site URL (or some affiliate URL). Your URL is present in the main browser window and in frame is little caption that it is url redirection with redirection link. You can set up percent for redirection (0-100%). At this way you can bring many visitors directly to your site, not over clicking to HTML ad like before. If you have some additional info, contact me at Longurl.Net/Contact.aspx
No! Spam is not allowed. If someone doing spam, than other users can report and he will be blacklisted. It is only for on-topic postings.
No, this is not exactly SPAM. While similar in nature, it is not violating any laws. Clearly this is a traffic redirection service. The traffic is not going to be high quality, and will have low conversion rates, for that reason it is very inexpensive. Many sites have very loyal visitors who are happy dealing with somewhat intrusive ads on the site, in order to access a valuable service offered for free. Unless something is not as it appears here, then there is nothing wrong, and the flaming posts in this thread directed towards the thread starter are closer to the definition of SPAM in some ways.