I noticed recently that I was getting more website traffic from LinkedIn by sending my tweets into LinkedIn than from Twitter itself, with roughly equal networks; that was right before Twitter cut LinkedIn off. Since then I’ve used IFTTT to do the same thing, and actually prefer the tweets via IFTTT to the former, uglier Twitter branded ones.
Don’t get me started on LinkedIn groups; see my question: LinkedIn Groups: Why is there no convenient way to follow LinkedIn groups? This has got to be one of the biggest wasted opportunities on the Internet. No feeds, no decent iPhone apps…. 50 groups worth of email digests is unusable…. 🙁