Could you please elaborate a bit on your query? Where are you seeing this and how it relates to Dropbox? Can you send me a screenshot so I can have a visualof the matter at hand (merely to send you the most appropriate information)?
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ICQ is a messenger service, similar to AIM, MSN, etc., that was popular in the late 90s and early 2000s, though it started making a bit of a comeback last year and still has a decent following. If you're asking about it in relation to your forum profile here (where there's a section to add IM screen names), you can simply ignore it. It's not something that's needed for Dropbox.