Don't be naive. Don't give anything personal away to strangers, including personal opinions or personal information. Dangerous. Would you invite a stranger into your home just because they knocked? No, I hope. One would hope that you wouldn't even open your door, let alone speak with them at all. Even more dangerous online.
Me too -- no idea. Just got first call. Had call from same area code earlier in the week and the reports on that number were that it was a political survey. That call came day after elections. Not sure if this is number is related.