Nowadays, many of us receive e-mail invitations to join social networking websites such as Facebook, LinkedIn, or MySpace. These services make it easy for members to send out invitation emails complete with response links, and it is in their best interests to do so - as more friends sign up, these sites register higher visits and page views, potentially leading to increased advertising income.

While only a few well-known social networking sites used to exist, this number has skyrocketed, resulting in many more invitations in your e-mail Inbox. Even if you know the sender and name of a social network to which you've been invited, before you click on an invitation response link, take a second and consider that not all invitation e-mails are what they seem. Some fraudulent "friends" and "social networks" could have drastic consequences to your security and privacy:

1) Make sure the invite link actually goes to the social network website and not somewhere else trying to "phish" for your personal information! It's better to copy and paste URLs into your web browser instead of clicking invite links, as there are many sneaky tricks to hide the true web addresses in e-mail messages.

Even when you copy and paste URLs into a web browser, before actually visiting the websites, look in the browser's address bar for any text such as "redirect" or "goto". These may be signs of someone trying to redirect you to a nefarious website.

For example, imagine getting the following link inside an e-mail message for a hypothetical "Google Social Networking Service":

http://translate.google.com/translate?u=stopbadware.org&hl=en&ie=UTF-8&sl=es&tl=en

Since the e-mail claims to be from "Google", and the web address contains "google.com", this will take you to a page on Google's website, right? If you visit the above link you will go somewhere else...

This misdirection link was just an example and fairly easy to detect. Real spam e-mails use lots of other tricks for obfuscating (hiding) true web addresses. Instead of copying and pasting links, it may prove even safer to just visit website homepages directly, skipping invitation links, and then asking senders to be re-invited as their friend.

2) Do you know the person sending the invite? Do you know the name of the social networking site? If you've never heard of neither, there's a high probability the site or the member is spamming. Sign up to the site and be placed on the user's "friend" list and your mailbox may be subjected to all sorts of unsolicited e-mail.

Just as responding to junk e-mail alerts spambots that your e-mail address is active, responding to junk social networking requests does the same thing.

If you do know the friend but not the social networking site, what's wrong with sending a quick e-mail to your friend and asking them if their invite was legitimate? If it was, no big deal, but if it wasn't, you might have alerted your friend to a problem they need to fix on their end.

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