Why do people put numbers in parenthesis before their status? like (315) or (404)?

It's from the website "Textsfromlastnight". People put a text from the website and place it in their status.

The number is the area code of where the text is from.

Hey Guys, They’re not as aggravating as the infamous “blue screen of death,” but 404 errors can still ruin a web surfer’s day. I don’t come across as many of ‘em as I used to, but I still thought it might be interesting to learn where the name came from. I asked the community if there was some sort of significance to the number “404,” and got a slew of great responses. Most folks explained that the number 404 is a kind of code that indicates, to those who bother to learn the code, what exactly the problem might be. In the case of the 404, the first “4″ indicates a client error. As a community member puts it, “the server is saying that you’ve done something wrong, such as misspell the URL or request a page which is no longer there.” The middle “0″ indicates a general syntax error. According to 404 Research Labs, a site used by several responders, this could indicate a spelling mistake. The last “4″ indicates the specific type of error “within the ‘40x’ group.” As one source puts it, the 404 status message is used “when the server does not wish to reveal exactly why the request has been refused, or when no other response is applicable.” Long story short, there is a method to the madness. A responder who works in the IT field writes that there are “standards for everything, including error messages.” For example, while a 4xx error indicates a client error, a 5xx message indicates a server error, a 3xx message indicates a redirect, and so forth. So, there you go, the mystery of the 404 has been solved thanks to you guys. Maybe now I won’t be as annoyed when I come across these errors. But probably not. Thanks for reading,

People don't do this. Facebook is putting up how many unread messages they have.