What’s the difference? When we write for a website we have to care about its easy tracking. Our title must be convenient for searching engines. When we write some text for social network, what’s our main target? Ofcourse, reactions! When you create a title like “Where to find blue socks?”, it’s more about search because it looks like retrieval request by itself. Some readers in social networks may know the answer but it’s not an attention-grabbing, however. The title “Blue socks: Wanted Dead or alive” is more attractive, isn’t it? Don’t you want to leave a laughing smile on Facebook? Or your own extra joke in comment? Maybe this example isn’t ideal but I hope you got it.