Profile pictures, activities and tweets should be integrated from LinkedIn, Facebook and Twitter so that when you look at a contact or company record you can quickly see who they are and what information is available through public sources. If you have account information for either network and add it to your Salesforce user account the system should be able to pull even more information for your direct contacts / friends.

MS Outlook 2010 is already doing this and it provides a lot of context that can be missing and is really powerful. I think that it would be a very important addition for Sales Reps so they can get a better understanding of new leads or existing clients. e.g. If an important deal is supposed to be closing and the prospect posts on LinkedIn that they're heading on vacation for 3 weeks that's going to extremely important information which affects their forecast.

A few extra fields may need to be added to the contact to link properly (to twitter and if the contact uses multiple email addresses). For companies there would need to be a linkedin company URL (though a default search could be fired on name) and corporate twitter account (if one exists). Any information brought across should have indicators showing where it came from. e.g. symbol in corner of picture and symbol preceeding activity post.