Generally used on internet forums, inb4 refers to a user posting a reply to a message/topic "before" another user posts an obvious response. When used appropriately, inb4 is followed by a word or short phrase that the user knows will eventually appear in the topic conversation.
Jonny113: Jiraiya would beat the crap out of Itachi.
Steven387: inb4MS
Mike128: You know Itachi has MS, so Jiraiya doesn't stand a chance.
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On Facebook, to re-post someone else's status as your own status. Similar to a retweet, but preceded by SS. Can be followed by the re-poster's own comment.
Official Form: SS @Original Poster: Original Poster's Status <<< Re-Poster's Comment (optional)
Larry's Status: I'm loving this new EA Game
Courtney's Status after seeing Larry's: SS @Larry: I'm loving this new EA Game
or
Courtney's Status after seeing Larry's: SS @Larry: I'm loving this new EA Game <<< I bought the Collector's Edition
Shared Status has just occurred
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