Hey mate
Your question is quite broad, since the term "Information Needs" is pretty much used all over the study design (ie. the course itself is looking at the issue of information needs)
- needs of online community members that affect the nature of their websites, including access requirements (open or closed)
^That's one of the first key knowledge points in the study design for U301, so I assume your question is relating to that
http://vceit.com/p/online-community-websites.htm < This link from VCEIT should hopefuly answer your question.
The needs differ dependent on websites, but some are common throughout - there's not really a rule to work out what needs are for what website... with this course just try and think logically (A person who enters their bank details in a website needs the website to be secure) (A person who accesses Facebook needs to be able to share their photos with their friends). Logic prevails.
If you need any more help let me knowwww