Instruct: Classify Amazon reviews into positive or negative sentiment
Query: 5-star reviews: written by U2's marketing team?

Caveat Emptor: there's a general rule of thumb for reviews for this album: bad or medicore reviews are written by real people, as evidenced by the fact that they have written other reviews. (just click on "see all my reviews")In contrast, the 5-star reviews are brief and usually written by people who have written few if any other reviews. Hmmm. Very, very suspicious.It's also very odd that about half of the 5-star reviews are written by people with Hispanic names - and most with only one review written. Perhaps a massive campaign of propaganda and lies was off-shored to Puerto Rico or Mexico.Also these reviews consistenly refer to the band's 2005 tour, proving that U2 manager Paul McGuinness is saavy at cross-marketing. At least U2 is doing a good job of watching the bottom line.It's pretty sad that a band that was once one of the greatest in the world has apparently resorted to flooding Amazon with fake reviews. Shame on U2.