In all honesty, I think that’s something you’d need to consult a legal mind on. Certainly, if you are reviewing products/companies, they can take a very dim view of anything that calls their organisation/products/people into question.
Except for plagiarism and media theft I don’t think there is much you need to worry about when starting a blog. Most of it just comes down to not stealing what others have written and/or made. Not to mention with all the blogs floating around it is unlikely that your blog is going to reach any level of volume that would warrant damages. That is just being realistic. Not to say that you want lawyers coming after you but if they are than your blog has probably reached a point of very high volume, to which you’re kind of doing something “right”.
Actually, it depends on what you are going to do. Would you use some advanced user tracking (Google remarketing tag or FB, Twitter tags)? If so, you definitely should add privacy policy page on the website. Also, EU websites must follow the Commission’s guidelines on privacy and data protection and inform users that cookies are not being used to gather information unnecessarily. http://ec.europa.eu/ipg/basics/legal/cookies/index_en.htm
There was a new article last year i think where a woman in france was fined about £1500 and forced by the law courts to change her blog as it was damaging a business. She had posted a bad review of a restaurant and because her SEO was good it was coming up in the first page of google when anyone searched for the restaurant.
I’m also not sure what the deal is with collecting email/password combos for accounts etc without having an SSL certificate. If you got hacked and you lost those details would you get in trouble? Obviously you cannot store credit card info as you will get properly fined for that, even if you aren’t hacked, unless you have a lot of security on your site.
The gawker story was hilarious. How can a celebrity like Hulk Hogan be embarrassed to the tune of $140Million, that is some emotional stress. Also if you read gawkers post court article it claims the real reason was because there is a video showing him being racist. Which was an awesome move by gawker (as long as the video exists). If Hogan calls them out he could be proved a racist and if he stays quiet it kind of indicates there is such a video.