Why we put up with advertising
But a newspaper can't sell advertising space until they can prove that they have readers. So there is a lot of up-front work that has to be done when creating a vehicle for advertising. On the internet, when something attracts a crowd, it attracts advertising. For the past decade, there have been many attempts to create this type of vehicle, the most successful being Facebook. Facebook is free for the same reason that anything like that is given out free - because it's supported by advertising. If there were no advertising to support it, would you pay a subscription fee? I have no idea what it costs to keep a site like Facebook up and running, but the overhead is probably pretty high.
If you're new to Google+, you might be pleased to see that you are getting this free service with no advertising. But for it to continue to be free to you, someone must pay for it. And it will be paid for by the same people who pay for your newspaper - advertisers.
Posted by Brad Hall