Developing a facebook chat app?

[Devine Caesar]

You'll need to visit the Facebook Developers site [1] and check that what you want to do is possible first. Although you can chat on facebook chat through windows live messenger and you can through ebuddy as well so I would imagine it is possible.

Their developer site also notes Facebook Chat supports Jabber/XMPP, the open standard for instant messaging. So you may want to start with [2] JXA - the Java XMPP API for J2ME.

I would note before you put the effort in that unless you have some novel idea or something new to bring to the IM Client scene, commercial success isn't likely as there are several clients out there already which can be used for the same purpose - not meaning to discourage you just offering constructive criticism