1> if it seems too good to be true, it usually is
2> if you cannot verify their existence through Better Business Bureau or Standard and Poor's rating, MIGHT be a scam
3> if they demand payment via Western Union or MoneyGram to foreign country, ALMOST ALWAYS a scam
4> if their special offer is only good today or a day or two, possibly a scam
use common sense in evaluating such offers--does what they offer seem reasonable to you ? If not, LIKELY it is a scam.
Hope that helps.

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