The system is simple and, thus far, largely unavoidable. When a user attempts to make a post, Craigslist asks for verification with a viable phone number. It then automatically calls the number and issues a verification code which must be re-entered for the post to go live.
For the purposes of the IRA distributions, a first-time home buyer is anyone who hasn't owned a present interest in a main home for the previous two years. For example, if your parents have promised to leave you their home in their will, that isn't a present interest in the home, so you still qualify.
1 However, when looking closer there are differences among first-time home buyers and repeat home buyers.  The age of first-time home buyers fluctuates with household affordability. From 2003 to 2006, during the housing boom, younger buyers had a more difficult time entering the market and the typical age rose to 32. In 2007, the typical age of first-time home buyers fell to 31 and from 2008 to 2010 the typical age has remained at 30.