I moved in with my old roommates - a couple with a dog. 

E.g. right now you have "roommates" and they know it's your place.

She said her roommate is going to have SSN but is also fairly new.

As with any tenant/roommate you'll want to do a background check.

I talked to my college roommate about investing, He started analyzing the deals.

Or buying a duplex and having a roommate on your side? 

It's only a stepping stone to break free.While you are slaving, eat ramen, roommate up or live in trailer, avoid Starbucks and tuck every dollar you can squeeze out into a bank account. need 20% down and money for materials. so for 80K home (trashed), you will want 35K banked to get started, just a rough idea.Get a pro account on this site so you can access the PRO only blogs and avoid all the goofy stuff that can confuse you sometimes.Take NO advice from salesmen such as realtors/brokers.

They get room mates so that when they default they can move to a 3rd and 4th place and repeat the process. 

Considered: Minneapolis, Los Angeles, Las Vegas, Denver, Chicago, Kansas CityInvestments: Arguably the most "under construction" part of my plan, your insights are welcome and encouraged.2BR, 2+BA Condos with roommates - Lower values lower barriers to entry theoretically, but internet skimming of this investment implies that HOA assessments are an ROI risk to be likened to underestimated capex.

Sign a new lease, use a M2M in a situation involving unrelated room mates.