Yes, posting is a Scrabble word!

Verb

1. Affix in a public place or for public notice

2. Publicize with, or as if with, a poster

3. Assign to a post; put into a post

4. Assign to a station

5. Display, as of records in sports games

6. Enter on a public list

7. Transfer (entries) from one account book to another

8. Ride Western style and bob up and down in the saddle in rhythm with a horse's trotting gait

9. Mark with a stake

10. Place so as to be noticed

11. Cause to be directed or transmitted to another place

12. Mark or expose as infamous

Noun

1. A sign posted in a public place as an advertisement

2. (bookkeeping) a listing on the company's records

3. The transmission of a letter