I don't think Facebook influences real life, but it depends on your definition. As far as Zuckerberg is concerned he doesn't want anything but 'real life' on Facebook.
When it comes to business Facebook is like a funnel. Facebook builds the interest in your brand, which does lead to them visiting your website and then buying your product. Its about giving proper credit to the right places. You dont' want to give all the credit to your Facebook page, google search or your website. Each played a vital and different role in getting a customer to convert on your website. Use them all, and it will give you "real world" results.
Yes it effect somewhere real life you know, people share, discuss, make fun, enjoy in Facebook, why people get addicted for Facebook they some where connect it with there life so.
If we see about study point of view then bad habit for student if for business man and communication purpose facebook going good.
It's changing a lot of people's real life. Socially and economically. It's changing the way of business as well.
facebook has become very dumb with how many people expose there personal life's on it. like I get the point its to connect with people but come on guys.... does everyone have to know what you do every minute of the day? believe me I have read some really stupid stuff on there that I often wonder how some people can really carry on day to day after exposing... so for the safety and well being of the public I think that facebook should be ALL fiction, especially with the hole check in portion... "hey guess what mommy I got a new stalker and he uses facebook 'Check In' to follow me where ever I go and he uses my statuses to learn everything about my personal life".... reality you ask??? its way to real for the internet!!