Were you actually confused? Are you smart enough to know what an "em" dash is and not smart enough to know that the hyphen in heads-up works differently than Fa

Were you actually confused? Are you smart enough to know what an "em" dash is and not smart enough to know that the hyphen in heads-up works differently than Facebook-Zynga. The only way that would make sense is if they merged and for some reason kept Zynga as part of their name. Given the context that's obviously not happening. An em dash is typically considered bad practice in formal writing. If he wanted to be formal he would have used a semicolon I think. In informal writing an em dash often replaces the work of other punctuation. Note: I don't care. I was able to understand him just fine and that's all I care about. If he was writing a scholarly paper I'd take the time to correct it and send him some suggestions. I'd also only do this if I was asked to do so.