Paul:
"Today's date" is December 28th, 2012. Thanks for the opportunity to bid on this project-- I provide clear and effective writing, editing and marketing services for business clients.
For £20 I offer 800 words of well-researched, flawlessly-written content regarding your selected topics, with each word chosen to inform, engage and entertain readers.
Please see my accompanying generic sample content. I'm certain I can meet your specific requirements for writing about almost any technology or business topics, as well as social-media, marketing, and most other topics on your list.
Thanks again for the opportunity to bid on this project!
Ed