Share to wall or post - Is an API needed?

Hello all, I am under the impression that you need an api id to share to an fb/twitter/linked in wall. But
``
http://www.facebook.com/sharer/sharer.php?src=(redacted)=(add link to be shared here)

http://twitter.com/share?url=(add link to be shared here)

http://www.linkedin.com/shareArticle?mini=true&url=(add link to be shared here)

``

Seem to work just fine. Could I get some feedback and advice on the bkm for this thing?

Thank you

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