The share links are much better than share buttons. Because Share button need script to be loaded and also track our web pages to find number of shares or tweets. If you dont want complex script loading and share count. You can go ahead with simple share links.
For Facebook, you just need to add this link in everyone of your posts.
http://facebook.com/sharer.php?u=http://url-of-the-post
In the case of Twitter, you can use this one:
http://twitter.com/intent/tweet?url=http://url-of-the-post&text=Title of the post&via=your-twitter-handle
Finally in the case of Google Plus you may use this one.
https://plus.google.com/share?url=http%3A%2F%2Furl-of-the-post