Facebook's public debut was the most anticipated tech IPO since Google went public in August 2004. But the stock has lost much of its value since it began trading in mid-May.

Below is a look at how the stocks of some recently public companies are faring. The companies are all loosely Internet-related, though their businesses vary widely.

— Facebook Inc., social networking company, first day of trading on May 18, 2012

Pricing: $38 per share

First-day's close: $38.23, up 0.6 percent from IPO price

Thursday's close: $19.87, down 48 percent from IPO price

Trading range since IPO: $19.82 to $45 (before Thursday)

— Yelp Inc., developer of online games, first day of trading on March 2, 2012

Pricing: $15 per share

First-day's close: $24.58, up 64 percent from IPO price

Thursday's close: $21.76, up 45 percent from IPO price

Trading range since IPO: $14.10 to $31.96

— Zynga Inc., developer of online games, first day of trading on Dec. 16, 2011

Pricing: $10 per share

First-day close: $9.50, down 5 percent from IPO price

Thursday's close: $3, down 70 percent from IPO price

Trading range since IPO: $2.66 to $15.91

— Jive Software Inc., creator of tools to run social networks for businesses, first day of trading on Dec. 13, 2011

Pricing: $12 per share

First-day close: $15.05, up 25 percent from IPO price

Thursday's close: $16.19, up 30 percent from IPO price

Trading range since IPO: $14.18 to $28.15

— Angie's List Inc., consumer-reviews site, first day of trading on Nov. 17, 2011

Pricing: $13 per share

First-day close: $16.26, up 25 percent from IPO price

Thursday's close: $11.16, down 14 percent from IPO price

Trading range since IPO: $10.77 to $19.82

— Groupon Inc., online deals company, first day of trading on Nov. 4, 2011

Pricing: $20 per share

First-day close: $26.11, up 31 percent from IPO price

Thursday's close: $5, down 75 percent from IPO price.

Trading range since IPO: $5.28 to $31.14 (before Thursday)

— Pandora Media Inc., Internet radio company, first day of trading on June 15, 2011

Pricing: $16 per share

First-day close: $17.42, up 9 percent from IPO price

Thursday's close: $9.71, down 42 percent from IPO price

Trading range since IPO: $7.83 to $26

— LinkedIn Corp., online professional network, first day of trading on May 19, 2011

Pricing: $45 per share

First-day close: $94.25, more than double IPO price

Thursday's close: $103.99, more than double IPO price

Trading range since IPO: $55.98 to $122.70