please include a way to access ones accounts on social networks powered by elgg. please see http://www.elgg.org

i would envisage for login:

username
password
name of network
url of network

this would allow any elgg powered social network (a turnkey site or any other) to be accessed by digsby.

from there digsby could grab a list of tools from the site and enable these in a menu for the digsby user.

digsby could also make use of the sites mailing and notification facilities etc.