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If you're going to automatically generate the description then I suppose you want to take in to consideration how that description is used by the SERP's. If your description is too long then it won't all be displaying on the SERP and you get the dreaded ...

I'm not sure really there is anything else you need to consider, although obvious data protection rules apply if you're using user data in such a way.

Hi Matt,

Yes they all are! I'm going through the responses now and trying out the suggestions.

In the 4 months we've been putting content on to our Google+ page, hashtagging it and posting on to UK communities we've had zero traffic from it. The same posts generate a good stream of traffic from LinkedIn and Twitter, so I think you're right. The information it provides to the searches are about the only use for it in my opinion.