chilllingeffects has some good info on linking
http://www.chillingeffects.org/linking/
including this FAQ
http://www.chillingeffects.org/linking/faq.cgi
"Question: If a hyperlink is just a location pointer, how can it be illegal?
Answer: It probably isn't, however, a few courts have now held that a hyperlink violates the law if it points to illegal material with the purpose of disseminating that illegal material: 
- In the DeCSS case, Universal v. Reimerdes, the court barred 2600 Magazine from posting hyperlinks to DeCSS code because it found the magazine had linked for the purpose of disseminating a circumvention device. (See Anticircumvention (DMCA).) The court ruled that it could regulate the link because of its "function," even if the link was also speech. 
- In another case, Intellectual Reserve v. Utah Lighthouse Ministry, a Utah court found that linking to unauthorized copies of a text might be a contributory infringement of the work's copyright. (The defendant in that case had previously posted unauthorized copies on its own site, then replaced the copies with hyperlinks to other sites.) 
- By contrast, the court in Ticketmaster v. Tickets.com found that links were not infringements of copyright. 
Like anything else on a website, a hyperlink could also be problematic if it misrepresents something about the website. For example, if the link and surrounding text falsely stated that a website is affiliated with another site or sponsored by the linked company, it might be false advertising or defamation. 
In most cases, however, simple linking is unlikely to violate the law."
so simple linking, alone, can't be seen as illegal. there might be problems if you are linking in such a way as to suggest you are somehow affiliated with the organisation you are linking, or if you are linking to material that would be illegal to download. but just linking a news article for discussion wouldn't be problematic. Why are your blog users just linking to one news source, tho?