If you were in the business of selling Google Places rankings, my suggestion would be to hire real users or even coordinate with the company to connect with their customers to apply these social factors.
Obviously, this will change your pricing, so this should give a lot to think about your business model.
These are the 8 Social Factors that are in Google+ Local ranking algorithm now:
-They must come from local users in your city, most likely you need unique local IPs
-They must be posted by real google users and your google name will be displayed.
2) Reviews on Other Sites
This feature is officially back again. So your fans should not only leave a review on Google+, but also on other review sites such as yelp, citysearch.
3) Driving Directions Request
Google tracks how many people requested driving directions, both on their computer or mobile devices. These stats are available on the admin section of Google Places for business owners.
4) Custom Maps
Google tracks how many people include your business in their custom maps.
5) Google +1
How many times your business page is G+1'ed is much larger factor now in rankings.
6) Google+ Share
Just like G+1s, sharing with comment with your circles is integrated right in it. Google will likely to look how many times your business listing is being shared.
7) User Uploaded Photos/Videos
If more people are uploading random photos/videos of your business listing, these are giving serious indication of popularity for your business page. These are much more powerful than the photos you have uploaded and named with your keywords.
8) Checkins / Automatic Checkins
Checkins are finally here, especially well integrated with Google Latitude. Google even made it easier for people. If you are at that xyz place, your phone can check you in automatically with a notification. So needless to say, more checkins a place is getting, more popular that business is.