ergophobe - 4:13 pm on Sep 1, 2012 (gmt 0)

For Twitter you'll need to do something like this:

<a href="https://twitter.com/share" class="twitter-share-button" data-url="http://example.com">Text to Tweet</a>

Where example.com is the URL to tweet and Text to Tweet is, well, the text. Here are some docs:

https://dev.twitter.com/docs/tweet-button/faq
https://dev.twitter.com/docs/tweet-button
[twitter.com...]

You'll need to find similar documentation for each service you want to use and then roll your own implementation.