Poll: Half of Americans call Facebook a fad---------------------------------------CAPTION: Half of Americans think Facebook is a passing fad, according to the results of a new Associated Press-CNBC poll. And, half of Americans say the social network's expected IPO asking price is too high. (May 15)----------------------------------------[Location - Date:][Source:] Associated Press/Facebook[VO:][VOICE-OVER]TRACK#1 HOW POPULAR IS FACEBOOK?A NEW ASSOCIATED PRESS-CNBC POLL FINDS THAT HALF OF AMERICANS THINK THE SITE IS ALL BUT A PASSING FAD.THAT'S MOT TO SAY THAT A LARGE PORTION OF ADULTS ARENT INTERACTING ON THE SITE. 40 PERCENT LOG IN ON A REGULAR BASIS.56 PERCENT OF FACEBOOK'S AMERICAN USERS ARE YOUNG, AND A STAGGERING 81 PERCENT OF 18-35 YEAR OLDS HAVE ACCOUNTS.BUT AS THE COMPANY'S IPO FAST APPROACHES, THE POLL SHOWS ANOTHER INTERESTING FIGURE: HALF OF AMERICANS THINK THE EXPECTED ASKING PRICE -- $34 to $38 -- IS TOO HIGH. THAT WOULD VALUE THE COMPANY AT $100 BILLION, MAKING IT WORTH MORE THAN DISNEY, FORD AND KRAFT FOODS. STILL, ABOUT 3 IN 10 INVESTORS SAY THE EXPECTED VALUE OF SHARES IS FAIR. OVERALL, THE PUBLIC IS SIMILARLY DIVIDED ON THE COMPANY'S FUTURE. FORTY-SIX PERCENT PREDICT A SHORT TIMELINE FOR FACEBOOK, WHILE 43 PERCENT SAY IT HAS STAYING POWER.