Dear Employer,
First, I'm very interested in this project since it involves exactly the tasks I'm best at (social media marketing)
I will write you 100 relevant, engaging comments for a total of 55$.
I'm sure you'll want them as soon as possible and I can deliver them for you in record time.
I'd love to know more about this project and I'm open to continuing this over Skype or e-mail.
Thank you, Alexandru.