AP Stylebook, K-12

One word or two? Hyphenated? Caps or small? Language evolves. The 2011 Associated Press Stylebook lists these social media guidelines.

check in (v.)
check-in (n. and adj.)
download
e-book
e-reader
email
end user (n.)
end-user (adj.)
hashtag
liveblog
mashup
metadata
retweet
smartphone
website
wiki
YouTube