Instant messaging is a popular topic of Ask Leo! questions, second only to email related issues, I would guess. BigBlueBall is a resource for both the latest news and support for all popular IM clients and technologies.
From the site:
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While BigBlueBall includes lots of informative news and other articles, the biggest value I see for people that come to me is it’s extensive support forum which includes help for many, if not most, of the common problems people experience with various IM clients. The Windows Live Messenger FAQ alone is worth a visit.
When I first came across BilBlueBall they were primarily about instant messaging. In the years since, they’ve expanded into social media and mobile topics as well.
If you have a problem, or are just looking for information, Big Blue Ball is worth a visit.
I recommend it.