The missing LinkedIn.

While the Internet offers many annoyances, one of the most irritating is LinkedIn. Every week I get requests from friends past and present to connect with them on LinkedIn. I have no idea what LinkedIn is. I do not use it. Am sure it would be of no value to me, and of no more interest to me than FaceBook or Twitter. And since Comcast has screwed up my e-mail for almost a month now, I cannot easily tell these people that I am unable to fulfill their request.