I get responses like that to Craigslist ads, and also some from BYC. I try to be polite, but I definitely don't take them seriously.
This is why I allow my daughter, at age 6 (we actually started at age 5, when she expressed interest), to have her own little blog, an email and a Twitter account (locked, family/friends only), and a Goodreads account for reviewing books she's read. I want her to be comfortable with the computer and the Internet and social media, but doggone it, I want her to stay LITERATE.