"There is no such thing as a free lunch" Advertisers fund the internet, not users. The more users you have, the more you charge for advertising.
Don't know you breadfan, but that question sounds like it's from a worn tired script, posted by a person who doesn't have a clue what INT and Ortsbo encompass.
Here is one for you. How much does it cost to join Linkedin and how has their SP performed in the last 365 days?