This is a good example of why post summaries are considered off-topic on HN. If it becomes the top comment (which it often does if people agree with it or are riled up by it) they'll reply to the summary rather than posting their replies as root comments to the main thread, creating a split between replies to the top comment and root replies.
Also, please don't use a title for the HN submission that's different from the title of the original post. The guidelines are specific about this.
I guess that's what they're hoping for. With my admittedly biased opinion of the average linkedin user, about 99% will have the default set of extensions installed and so will not be very useful. Those users might have other identifiers of course, so who knows.
Also, please don't use a title for the HN submission that's different from the title of the original post. The guidelines are specific about this.