Blakesy writes:

Posting annoying Web messages or sending annoying e-mail messages without
disclosing your true identity is a federal criminal offence:

47 U.S.C. 223: "Whoever...utilizes any device or software that can be used
to originate telecommunications or other types of communications that are
transmitted, in whole or in part, by the Internet... without disclosing his
identity and with intent to annoy, abuse, threaten, or harass any
person...who receives the communications...shall be fined under title 18 or
imprisoned not more than two years, or both."

Read the entire text that you quoted, including the part about intent and a
personal target. Note also the absence of the word "true" before "identity."