In this sense, it is similar to contextual recommendation systems like Sphere, OutBrain, or BlogRovr, which all append recommended links at the end of blog posts or news articles using a variety of methods.
There is also an option to append a link to the song shortened using Bit.ly.
If you rent a film from Netflix, Swurl will append a link to the movie's trailer on YouTube.
2tweet will use the first 113 characters of the Email's subject line to lead off the tweet, and will then append a link to your web gallery.
Also worth noting: the twenty free texts append a link to the app to the end of your message (if you upgrade, this will be removed, though not til an update goes live later this week).
Facebook could even go a step further, potentially appending a link to Newswire or a warning if it sees people sharing posts that Storyful has assessed to be fake.
That link appended a language marker at the end which varies depending on which country the user is located in the world — such as "gb" for the UK, or "fr" for France.
The references used to generate the content of the database entries can be appended, including a link to the PubMed entry.
PIPEMicroDB is appended with other useful links, the team and contact persons.
BuffSatDb is appended with other useful links, the team and contact persons.
