the pinecone ads suddenly appear & disappear on lotsa different sites. the only way i know of is to keep an eye out for posts saying that someone saw the ad (normally, someone just happens to be at a site when "it" pops up) & sign up immediately.
btw, don't know if you do american consumer, but they're pretty good too. pre-qual screeens get you entered into contests <yawn

>, but you get real dollars ($4 to $20) for surveys that you qualify for & take. (i just rec'd an $8 check from them - they pay fast, too).
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fyi, there aren't referral benes, hence the above is a direct link.
hth,
laurie s