Keep all free ads directed to your business information while setting up an account on Craigslist or other free advertising site. If you decide to advertise for free on Craigslist, make sure your email settings are safe. Use your web site's email at all times. Set your advertising to target only the country(s) with whom you want to do business with when initially setting up your free account. Otherwise there is a high chance that you will be bombarded with mass amounts of spam of the worst kind. If you make the mistake of using your own personal contact information, including email address during set up of your account, you'll likely receive all the usual spam from a Nigerian Prime Minister needing to transfer money (in order to try to extract your bank account information). You may even receive a fake check in the mail for money. This can happen to anyone when listing a personal item for sale. The moral is: Do not post personal information for all to see on Craigslist and other free advertising venues. These same issues happen with traffic exchanges as well (see next).
For our client: We rolled out a successful implementation of rel="author" for the three in-house content writers the company had. The client had over 300+ articles made by these content writers over the years and it was possible to implement rel="author" for all the aged articles. I advise anyone who has a large section of content to do so as it will only benefit the website. We were also in the process of rolling out further schema markup to the site's course content as it only has a benefit for CTR.