A Craig's list ad will probably reach a broad audience but an ad here or you local REIA bulletin board will be targeted to people who understand that it is an investor deal. 

Target international students or grad students over frats.

Are there others that anyone targets, that I am missing?

In any type of marketing, figure out how you will drive targeted people to look at what you put out there.  

“Twitter really allows for more of a 360-degree view of your buyer and allows for more personal communication to take place.”Make a Digital ImprintTwitter for Real Estate: To Tweet or Not to TweetMix Up Your Social PersonaBeyond Facebook: Winning Strategies for Every Other Social Media PlatformViskovich suggests that salespeople segment their Twitter account into lists – prospects, competitors, partners, influencers, and customers – to then share targeted content accordingly.

Given your income target, I suspect you might be better served by Multi-family or other commercial properties in the future.

As for leads: Target and market.

Those are properties that are likely to have been inherited.I personally go after all non owner occupied properties where the owner name is not an LLC or other type of company name, in my target area.Hope this helps.Brian

Targeting likely motivated sellers is great and can save time and expense but ultimately the response rate is still going to be pretty low and you are going to get a lot of non-deals for every true prospect.

So you can target products based on this.For this you can ask your subscriber interests with checkbox/radiobutton fields.