Grammar
Style guide 
Web address rules
Reader's question: Are there any conventions for web addresses, i.e. should you try and get the whole address on one line and should you use http or www or both?
My answer: I think ideally you should try to fit the whole address on one line unless it's very long. If appropriate, you could use www.tinyurl.com to make the address shorter.
In the past, I think we used both http and www as both were needed to create a link. I don't think that is the case these days and I see the following variations: http://tinyurl.com; http://www.tinyurl.com or www.tinyurl.com.
When writing in print, the most important thing is to be consistent. I would probably choose www.tinyurl.com.
There's also the question of whether you put a full stop after a web address. In the past, most people didn't, based on the theory that if people copied and pasted the address, the full stop would prevent the link working. Given that you can click on links in print documents, I am not sure this matters. Once again, be consistent.
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