In the social networking space, that is. No, it definitely ain't me.
One site that tries to measure this is klout.com. Whether or not you make your twitter feed, blog site, LinkedIn account, facebook page or what-have-you known to klout it may well find you and attempt to evaluate your level of influence by counting the numbers of people that pay attention to you. By some sort of magic it also attempts to know what areas you take an interest in.
If you, as a career developer, want to know what advice the masses are grazing on these days then there might be no better place to start than http://klout.com/#/topic/careers. Some of these might be good places for us to sample as ways of learning how to present some of these ideas. Or maybe we should be saying something more useful or enlightening?