Hi Buttercup,
You could check with your tutor, however the assignments are your work and so should not be a problem - you will probably want to leave posting until after they have been marked though.
The only caution I would add is you keep your eyes on your refrencing and quotes. While the information will probably be useful and interesting you will probably lose credibility if you appear to be ripping off others work as your own. Keeping them firmly in place will add to your credibility, and act as sign post for those who are interested in finding out more.
For instance I know one poster who types out posts filled with 'facts and figures' and then copies and paste them onto a lot of forums. He quickly loses credibility because he never gives links or lists publications where he gets his information from and rarely replies to responses. He is now considered a spammer by many forums.
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Beauty is in the eye of the beholder and it may be necessary from time to time to give a stupid or misinformed beholder a black eye.