Linking to other writers articles at HP helps the community because search engines rate a page by how many links are associated with it.
If you link to your other articles it helps your hubs because readers can see more of your work.
Links that come from other sites and point to your articles are better for the same search engine reasons; Google rates by how many links from other sites other than HP point to your site.
You can post links to your articles at: IMautomator, SheToldMe, RedGage and Traffup.
These sites are free and can submit your links to multiple sites. SheToldMe is one that is rated highly by Google.
The "suggest new links" capsule is no longer available here at HP.