I am thinking of precise reasons why these services want the e-mail addresses in the first place. Is it to create a social network graph of the email addresses? Does this mean that all of these small services have a social graph? That doesn't seem so bad given that most people have already given that to one very large institution.
Ah. right. Probably shows I'm still practicing abstinence i.e. no smart phone with 3G plan yet. Still seems its a lot less to be concerned about in comparison to what other organizations own. I suppose the sneaky under the hood part is what's jarring.