The difference is e.g. the "Recuursive Mode" where one URL redirects to another and maybe another and then to your money site.
The link type can be defined, keywords in a more detailed way and so on. It's not based on certain engines either. If you know some new shortener URLs, I can probably add them to the internal database and it will find a way to submit to it while analyzing the page.
Comments
The difference is e.g. the "Recuursive Mode" where one URL redirects to another and maybe another and then to your money site.
The link type can be defined, keywords in a more detailed way and so on. It's not based on certain engines either. If you know some new shortener URLs, I can probably add them to the internal database and it will find a way to submit to it while analyzing the page.