By Brian X. Chen May 11, 2012 3:55 pm May 11, 2012 3:55 pm Apple’s iMessage, the free, Internet-based text-messaging service, isn’t the only thing AT&T’s chief executive should lose sleep over. Facebook is also eating into text-messaging revenues for carriers, according to a report. Strand Consult, a telecommunications consulting firm, released a research note on Friday saying that based on measur
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