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speculator asked: if i copy some text from other site,and back link it,is that illegal?
If you want to provide your users with access to the information, provide a hyperlink. You're certainly welcome to "embellish" this link with a review, a Fair-Use (that is, SHORT) snippet, and/or an endorsement. Unless you've paid a licensing fee or otherwise obtained written permission, you have no rights to "display" or "publish" the author's work.
If, on the other hand, you're just trying to fill up your site with information (that is, if you haven't created content of your own), then you might need to sit down and have a serious re-think about what your aims are: There's hardly much point investing in hosting, development, etc, just to see your site go dark the first time your web-host gets a DMCA notice because of your infringements.
Just my opinions, of course; I could be wrong....
As was mentioned, and as seems often overlooked, there's always the possibility of asking for permission to use someone's copy. If you're pretty sure your request would be turned down, that's a good indication that what you're wanting to do isn't okay.