open source libraries for facebook ,emails ,IM

Question

Can any one suggest me a open source library for 1)By which i can write on facebook wall of my friends? 2)By which i can send emails to the contacts in my fiends list of

1. MSN
2. 2yahoo
3. 3gmail
4. 4 etc

Answer 1

Have a look at - Facebook Java API.

EDIT:

Here is link that describes steps to publish on Facebook Wall. If you are wokring with web then look at - Tag Library for calling Facebook API functions in a JSP Page.