Distinguish between IMing with different people (friends vs. coworkers)

It would be useful if you could distinguish and tag who you're talking to in instant messenger, rather than just that you have instant messenger focused. (The same way that RescueTime can tell what website you're on rather than just that you're in a browser.)

I use Pidgin to connect to several IM accounts, one mostly for work and one mostly for personal stuff. Sometimes when I'm on IM I'm chatting with my husband (NOT productive) and other times I'm really hashing things out with a colleague (very productive).
 
indifferent I’m more productive when I turn off IM but it's so hard!
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