Log in with your Yahoo! ID to communicate with your online friends."

[Twilit1988]

My dear and respected teacher

1: "Log in with your Yahoo! ID to communicate with your online friends." correct?

2: "Log in with your Yahoo! ID to check your Yahoo! mail." correct?

3: "I want to sneak into the room." OR "I want to sneak in the room." ?

Thanks in advance!

[Mister Micawber]

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1: "Log in with your Yahoo! ID to communicate with your online friends." correct?-- I am not sure that it is the best idea to retain the Yahoo exclamation point. Many or most reputable writers do not, because it makes the punctuation confusing, as it would, for example, in the second extracted sentence here:

Yahoo (NSDQ: YHOO) has updated its iPhone application and given it voice search capabilities to keep up with Google (NSDQ: GOOG)'s iPhone app.

Yahoo's voice-controlled oneSearch is already available on other mobile platforms like BlackBerry, Windows Mobile, and Symbian, but this is the first from Yahoo on Apple's platform.

2: "Log in with your Yahoo! ID to check your Yahoo! mail." correct?-- As above

3: "I want to sneak into the room." OR "I want to sneak in the room." ?-- The first is the good written version; the second is often spoken but is ambiguous.
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Native English teacher at Mister Micawber's