Writing
Difficult words
clickthrough (n., adj.), click through (v.)
One word when used as a noun or adjective. Two words when used as a verb.
- Our online ads consistently earn a high clickthrough rate.
- Click through to see the results.
ecommerce
One word, no hyphen.
One word, no hyphen.
login (n., adj.); log in, log in to (v.)
One word when used as a noun or an adjective. Two words when used as a verb, which may be followed by the preposition to.
opt-in (n., adj.), opt in (v.)
Hyphenated as a noun or adjective. Two words as a verb.
- The opt-in has been disabled.
- To get electronic statements, you must opt in.
pay-per-click
Hyphenated (abbreviation: PPC)
setup (n., adj.), set up (v.)
One word when used as an adjective. Two words when used as a verb.
- Check your store setup.
- Your setup fee has been waived.
- Set up your account.
sign-in (n., adj.,); sign in, sign in to (v.)
As a noun or adjective, it’s hyphenated. As a verb, it’s two words, which may be followed by the preposition to.
All visitors must sign in on the sign-in page.
sign-up (n., adj.,); sign up (v.)
- Sign-up is easy.
- Submit the sign-up form.
- Sign up for the service.
smartphone
One word.
U.S.
Note periods, no spaces. The single exception is specifying currency in prices: US $299.
username
Lowercase, one word.