An estimated 57 percent of internet users will log in to upload a puppy photo, tell their friends about their weekend or help one another raise chickens in the collective Farmville by logging into Facebook this year.

An Internet research firm said on Thursday that advertisers are increasing their use of Facebook, and plan to spend over a billion dollars at the social network.

After nearly a decade of plunging music sales, the labels are trying to overhaul their traditional business. Instead of just selling recorded music, they want to use music to sell a range of related extras, from online advertising to mobile phones packed with tunes.

Social networks continue to grow. But like a teenage crush, the excitement over the marketing possibilities in them has eased.

In anticipation of second-quarter 2007 earnings calls from Google and Yahoo! this week, eMarketer has released new online ad spending estimates for the two companies relative to the overall US market.