What kind of expertise do you want... The profile page of most of the DO members have the ID of the IM they use.
you find it right below the reputation blobs, i am not sure if its a good idea to add someone without his/her consent!!
An easier way would be to post your question in here. People will reply, That is the whole point of a forum- knowledge sharing.
What expertise are you looking for though? Just post this question at chat section.. you'll get a lot of answers I would guess..