My question is: Since the contract is under addendum; can I market the house to potential buyers on my website and social media in case the first deal falls thru?

You are not their parent or a social worker. 

and its part of my social routine as much as BP I go  to the bank at least 18 out of 20 business days a month and I make my rounds..

These are subjected to income taxes and social security + medicare taxes.There is also capital gains (and many more).

Which social media platforms did you use and which targets did you set for you demographics. 

Social media will get you a zillion calls from wholesalers, claiming to have a huge buyers list (some actually do) and therefore the ability to close.  

You got to have all your social media covered. 

Using handwritten solicitation letters might help you.Keeping up with people that give weekly webinars like Paperless Agents talk alot about real estate marketing and how important it is to have knowledge, using professional-looking pictures and video, and popular Social Media advertising. 

My wife and I recently setup a trust (based on my social security number), and would like buy the replacement properties and keep them in the trust.   

This most definitely has had a negative impact on my social, emotional, and marital life.