Mark Birch has a great post today about using LinkedIn correctly when asking for introductions. Very timely as I was planning to write about introductions today and now need to write only a fraction because Mark covers everything else (he links to some prior posts which are also worth reading). And now for my two small additions that may be specific to me but probably will work fairly well for others also. First, I only make opt-in introductions. So if you contact me about an introduction, pl...