Share content from other sites to my elgg site

I know it is possible to share content from an elgg site to other social networking sites (facebook, twitter, google+, etc).  There are elgg plugins who allow you to do just that:

Consider a different scenario:
Let's assume that I own two websites, one that does not run elgg which we'll call "www.mywebsite.com" and a second site which runs elgg which we'll call  "www.myelggsite.com".
What if I want to add a "share this to www.myelggsite.com " button to the www.mywebsite.com which would enable users to share the content of www.mywebsite.com to www.myelggsite.com.
For example, should a visitor click on this button then the URL of the page I am currently browsing gets posted on the wire/river of the elgg site (www.myelggsite.com).
Is there a plugin that does this?
Are there any plans or thoughts to include/enable this functionality in future plugins for elgg?