Everything else, not buying it. The massive flood if information on the Internet makes it unlikely that anyone could even possibly connect the dots for relationships based solely on contact info. Heck a major problem with social networks is that there is TOO much information that they can't find easy patterns of behavior, motivation, etc.
Hey there, I can understand your position, but consider this. Sooner or later one of these shaky outfits is going to get a visit from "Anonymous" or some of their friends, and the entire database of contact information is going to be posted shamelessly online. From there it will be utterly trivial to build a searchable resource of not just users of that app, but everybody those users knew, possibly including you. And it could include phone numbers, email addresses, physical addresses, dates of birth, even notes like names of children, anniversaries etc. that people sometimes add to their contacts to make it seem like they're really good at remembering stuff.
That's the scary thing, its not a database of what you've published about yourself, its a database of what other people have written in private about you.
So, want to know where a celebrity lives? Just look them up. Want to put a competitor out of business? Look up who his clients are and drop them a line. Want to pull off a phishing scam? Call someone armed with their name, address and the name of their financial adviser. Need some quick cash? Look up all the phone numbers of houses in your street and call around to see who's not home today. Want to bully a kid? Just look him up and see if his parents know a divorce lawyer, or adoption agency. Got other interests in kids?..Well lets not go there, you get the idea...
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